Mars may have supported life in the past, but there is no evidence that conditions have ever been life-friendly on Mercury or Venus. Throughout history, Venus was one of the planets that many civilizations recognized. Life has yet to be discovered in any planets other than Earth. The dwarf planet is made up mostly from ice and rock, with a rocky interior and an icy exterior. If you look around our Earth you can see that we have an incredible amount of life that exists on both the land and within the waterways and seas. The moons are shaped like potatoes and have such a small mass that their own gravity can’t make them spherical like our Earth’s moon. When these particles are trapped in the magnetic field of the Earth they collide with the molecules in the air above the Earth’s magnetic poles. Many of these satellites are also communication satellites, bringing us our cable television and our cell phone service. A planet is a celestial body that orbits around a star. Mars is the fourth planet from the Sun and is one of the terrestrial planets. Terrestrial planets are often referred to as “rocky” planets. About 75% of Earth’s surface is covered in water. These ideas led to more stories, books, movies, and television shows than any other planet. “Mercury was the god of flowers and bouquets, which is why today he is a registered trademark of FTD florists. We do have one dwarf planet in our solar system that is thought to be a terrestrial-type world. The Earth is the largest of the terrestrial planets at 3,959 mi/6,371 km radius, and the fifth largest overall planet in our solar system. This soil is dusty and when it is kicked into the atmosphere during storms the planet turns a reddish color. They are named so due to the similar composition of the planets to that of Earth. The type of atmospheres of terrestrial planets depend on the planet’s distance from the sun, the radius, the mass, the amount of geological activity, and surface organisms. Our solar system is composed of four terrestrial planets: Mercury, Venus, Earth, and Mars. There are seven planets in orbit around TRAPPIST-1. In 2012, NASA’s spacecraft MESSENGER found water ice in the craters around the north pole of Mercury. Mars actually has many more colors than just the “red” that most people use to describe it. The name comes from the word “telluric” derived from the Latin words “terra” and “tellus”, used to refer to Earth. While the inner planets are rocky planets, the outer planets are referred to as gas giants. If you notice, except for Earth, all of the planets in our solar system are named after Roman and Greek gods and goddesses. Jupiter and Saturn have layers of molecular hydrogen and liquid metallic hydrogen under their atmospheres. It is the only planet named after a female and it’s thought that it was because it is the brightest planet. There are two broad layers of atmosphere on Venus including one layer that is a cloud bank covering the entire plant, and another that includes everything that is below the cloud bank. The planets closest to the Sun—Venus, Earth, and Mars—are the other three. The moons were named for the horses that pulled that chariots for Ares, the Greek god of war. The outer planets are Jupiter, Saturn, Uranus, and Neptune. Venus is the hottest planet in the solar system. Find out more about the inner planets by selecting one below: The Ultimate List of TV Shows set in Space or on Other Planets, The Planets and Moons of Star Wars to Scale, The terrestrial planets in our solar system orbit relatively close to the Sun, this gives them their other name; the “Inner Planets”. Another Mars tale on television and in books was “The Expanse.” Other stories that have taken place on Mars were transitioned to movies such as the 1990 “Total Recall” and the remake in 2012. Vega 1 1984: The most ambitious deep space mission by the Soviets with twin spacecraft designed with redundant mission goals. Lovecraft, and Arthur C. Clarke. We have had an international fleet of spacecraft that have orbited and some that have landed on Mars, including the robotic rovers. Discovering the nature of our home planet has been the topic of many books, movies, and television shows. Even Disney fans will remember the animated film “The Princess and the Frog,” where the firefly, Ray falls in love with Venus, “the evening star”, whom he mistakes as another firefly. Named after the Roman goddess of love and beauty, it was also known by the Greeks as Aphrodite. The solar wind distorts the magnetic field so that if you looked at it in space it would be a teardrop shape. Inner planets have a mostly iron core, surrounded by a mantle. https://solarsystem.nasa.gov/planets/overview/, https://www.space.com/17028-terrestrial-planets.html, https://space-facts.com/terrestrial-planets/, http://www.softschools.com/facts/space/inner_planets_facts/2411/, Our solar system’s terrestrial planets have an orbit that is relatively close to our sun and are also called the “Inner Planets.”. Other civilizations throughout history have also named the planet due to its color. Terrestrial Planet is a planet that is made mostly of silicate rocks or metal, with a solid surface. After Earth, Mercury is the second densest planet in our solar system. However, the magnetic polarity of the Earth doesn’t always stay the same, and the magnetic field can flip. The Ozone layer protects Earth and life from the extremes of solar radiation. Another name for Mars is “The Red Planet.” Mercury is the smallest planet in our solar system and Mars is the second smallest planet. Ceres; Pluto; Haumea; Makemake; Eris; Solar System. Mars has the largest mountain in the solar system called Olympus Mons. It’s though that the Earth’s magnetic field is due to the planet’s core, which is made up of nickel-iron, combined with the fast rotation of the Earth. Jupiter; Saturn; Uranus; Neptune; Dwarf Planets. You could stretch the crater from the U.S. West Coast all the way to the East Coast. Planets. The tallest mountain on Venus is Maxwell Montes, standing over 20,000 ft/8.8 km high. Earth’s atmosphere consists of 78% nitrogen, 21% oxygen and trace amounts of other gases including carbon dioxide, argon, and neon. The temperature of the inner core is as high as 9,800 degrees F/5,400 degrees C. Surrounding the inner core is the outer core, which is 1,400 mi/2,300 km thick. Conditions on the two closest planets to the Sun, Mercury and Venus, are too harsh and extreme to harbor any form of life. The robotic explorers have found a lot of evidence that at one time, billions of years ago, Mars was warmer and wetter, with a thicker atmosphere. Strangely, there have been many attempts at sending robotic spacecraft that have failed, but we are pleased to say that many also succeeded including: Mars Odyssey, Mars Express, Opportunity rover, Mars Reconnaissance Orbiter, Curiosity rover, Mars Orbiter Mission, MAVEN and ExoMars Trace Gas Orbiter. Scientists don’t think that they will ever find living things on Mars as the conditions aren’t good enough for life to thrive. However, the southern hemisphere is the exact opposite, with a lot more craters as well as highlands. Mars:eval(ez_write_tag([[250,250],'planetsforkids_org-medrectangle-1','ezslot_8',176,'0','0']));eval(ez_write_tag([[250,250],'planetsforkids_org-medrectangle-1','ezslot_9',176,'0','1'])); The core at Mars’ center is very dense and is between 930 and 1,300 mi/1,500 to 2,100 km in radius. They established three rules that are required for life: liquid water, some source of energy such as our sun, and a source of food. It’s believed that meteorites or comets may be responsible for delivering ice to these locations or water vapor may have been outgassed from the interior of the planet and then out to the poles. They are characterized by their dense, rocky composition. It has a rocky core and an outer mantle, with surface features such as craters and mountains. Our terrestrial planets may be higher in density that the gas giants, but unlike the name, the gas giants aren’t completely made up of gas. None of the terrestrial planets in our solar system have any rings. It’s believed that the name “Earth” is around 1,000 years old. Today we often call Mars the “Red Planet” due to the iron minerals on the surface. Facts about the Planets. Earth is the only one with liquid oceans, although Mars may have had them in the past. http://www.softschools.com/facts/space/inner_planets_facts/2411/. https://www.space.com/17028-terrestrial-planets.html A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals.Within the Solar System, the terrestrial planets accepted by the IAU are the inner planets closest to the Sun, i.e. The most notable of the situations was the 1938 radio drama of the H.G. None of the terrestrial planets in our solar system have ring systems. Jupiter and Saturn are the outer gas giants.eval(ez_write_tag([[300,250],'planetsforkids_org-medrectangle-4','ezslot_3',198,'0','0'])); Uranus and Neptune are the outer ice giants. This collusion causes the molecules in the air to glow and this is known as the Aurora Borealis or northern and southern lights. The discovery of large volcanoes on Mars shows that the planet had active tectonic plates at one time in its history. In today’s video games, Venus has been used as a backdrop for such games as Transhuman Space, Battlezone, and Destiny. It has an iron core that accounts for about 3/4 of its diameter. The television series “Firefly” and the book and film adaptation “The Hitchhiker’s Guide to the Galaxy” are two such stories. 2004 Messenger Probe: The probe orbited Mercury for four years, sending an incredible amount of data back to Earth before it crashed into the surface. This is a hot, thick mixture of molten rock that has the consistency of caramel and is around 1,800 mi/2,900 km thick. Venus Express 2005: The (ESA) European Space Agency’s Venus Express is studying the Venus atmosphere including the surface to the ionosphere. As far as anyone knows, this flip hasn’t caused harm to Earth’s life, and another one isn’t likely to happen for at least another thousand years. The Mars winds can create incredibly strong dust storms that cover a lot of the planet. Lewis, Ray Bradbury, H.P. Extensive research has gone into the idea that the atmosphere on Mars might also have an impact on the presence of liquid water. Mars does have two small moons: Phobos and Deimos. Asterisms; The Asteroid Belt; … Of all of the planets and bodies in our solar system, Mars is the most explored and the only planet that we have sent rovers to travel the landscape and collect samples and data. These are Earth-sized as well as called “super-Earth” and exist throughout the galaxy. During the high tides, they decide to stay in the … The surface is covered with a lot of craters that that were caused by collisions with comets and meteoroids. It’s heavily cratered with many deep surface grooves. Terrestrial plant surfaces include the existence of mountains, canyons, volcanoes, and craters. A critical requirement is that they have a heavy core made up of mostly iron and that a portion of that core be in a molten state. The atmosphere of Venus is mostly made up of carbon dioxide and has clouds of sulfuric acid droplets. Q. Surrounding the core is the planet’s rocky mantle which is between 770-1,170 mi/1,240-1,880 km thick. Phobos is the largest moon and the one closest to Mars. An AU is the distance from the Sun to the Earth. https://space-facts.com/terrestrial-planets/ Larger terrestrial exoplanets (those at least twice as massive as Earth) are classified as super-Earths. (Mercury is the closest planet to the sun. It is moving slowly toward Mars and it’s believed that in about 50 million years it will either break apart or crash into Mars. In this video, we will learn about terrestrial planets. This indicates that there are traces of what once was a magnetic field around 4 billion years ago. There are a lot of similarities between Venice and Earth, and one of the most notable is its structure. It’s due to this odd situation that it often looks smoother than Phobos. It takes around eight minutes for light that leaves the sun to reach the Earth. This was, of course, before science had discovered how horrible the surface and atmosphere was. The surface is a bulging thin rock crust that moves as the mantle shifts. eval(ez_write_tag([[300,250],'planetsforkids_org-large-leaderboard-2','ezslot_7',192,'0','0']));Another thought is that the name “Earth” is derived from the Old English word “ertha” as well as the Anglo-Saxon word “erda”, which means soil or ground. )A year on the planet nearest to TRAPPIST-1 would last just 1.5 Earth days. Q&A Corner. If you were on another planet looking back at our solar system, you would see our sun as a star.eval(ez_write_tag([[300,250],'planetsforkids_org-box-3','ezslot_0',197,'0','0'])); It’s believed that every sun has planets orbiting it. Wells book, “The War of the Worlds.”, The broadcast was so realistic that many listeners though that there really was an invasion of Earth by Martians, and went into a panic. The crust is between 6-30 mi/10-50 km deep.The Mars surface is divided by the hemisphere of the planet and is in two distinct types of features. Venera 13 1981: Designed similarly to the previous Soviet twin missions, Venera 13 and 14 were spacecraft to accomplish Venus flybys. It is similar to Earth’s highest mountain, Mount Everest. Above the core is a mantle that consists of hot rock similar to lava that churns slowly due to the interior heat of the planet. 2018 BepiColombo: The ESA (European Space Agency) launched BepiColombo as part of their first mission for the exploration of Mercury. However, in the past number of years experts have discovered Earth lifeforms that live outside of these ideas. The difference between the two planets is that runaway greenhouse effect on Venus allows temperatures over 480 degrees C, whereas Mars never goes higher than 20 degrees C. The variation is also credited to the density of the two atmospheres. Mars has the largest mountain in the solar system called Olympus Mons. The liquid metallic hydrogen layers also conduct electricity. Ceres is covered in countless small, young craters, no larger than 280 kilometers or 175 miles in diameter. Space is a very strange place and things don’t work the same way as they do on earth! Earth is the only known planet to support life and was formed around 4.54 billion years ago. Earth has remained as a base for other space exploration stories, including the iconic “Star Trek” series. To determine if some of these worlds have atmospheres, oceans or other signs of habitability, it takes more investigation. Facts about the Terrestrial Planets. Deimos is strangely shaped and is covered in loose dirt that sometimes fills in the craters on its surface. Terrestrial planets are also called “telluric planets or rocky planets.” These planets have to consist of a majority of silicate rocks or metals. The Solar System. The name for terrestrial and telluric is derived from the Latin words for Earth: Terra and Tellus. Comparisons have shown that the magnetic field is only around 1% of Earth’s, but it’s highly active, being responsible for the solar wind tornados on the surface of Mercury. Our solar system consists of our star, the Sun, and everything bound to it by gravity — the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, dwarf planets such as Pluto, dozens of moons and millions of asteroids, comets and meteoroids. It is often said that they are similar to Earth. The consistency of the clouds is very dense and they are made up of sulfuric acid and Sulphur dioxide. It was named about the Roman messenger god that was known for moving fast, because the planet orbited the sun more quickly than other planets. Scientists believe that they have found evidence that shows that part of the metallic core is molten or liquid. The Ancient Egyptians called Mars “Her Desher,” which translates to “the red one.”. In this version, the ultimate tale involved terraforming Mars and a colony struggling due to lack of air. Facts about Terrestrial Animals 8: semi-terrestrial One of the examples of semi terrestrial animals is fiddler crab. Ceres has both a rocky core and an outer mantle and its surface includes mountains and craters. Earth is the most hospitable to life. Magellan 1989: Accomplished its mission as the first to ever arrive and map Venus’ entire surface. There have been more missions to Mars than any other planet. The terrestrial planets that exist within our solar system are also those that are the “inner planets” or those closest to the sun: Our four terrestrial planets include Mercury, Venus, Earth, and Mars. These are the inner planets closest to the Sun. When you stare at the surface of Mercury, you can’t help but realize that it resembles that of our moon. TV and movie writers also seemed to be enthralled with the little planet as part of their scripts. While some planets do have an atmosphere, Mercury doesn’t have one. # 2. Interesting Inner Planets Facts: The solar system is believed to have formed roughly 4.568 billion years ago. In one of the series Calvin and his friend Susie give a class presentation about Mercury, and Calvin fills the presentation with very questionable information such as: “The planet Mercury was named after a Roman god with winged feet,” says Calvin. terrestrial planet (inner planet) The term used to classify the four inner, rocky Earth-like planets (Mercury, Venus, Earth, and Mars) of the solar system, which, relative to the jovian (or outer) planets are smaller, have high densities, are composed of metallic (mainly iron) and silicate phases, and have low contents of gaseous elements. All rights reserved. Akatsuki 2010: The Venus Climate Orbiter mission (PLANET-C), or “AKATSUKI”, is studying Venus’ atmospheric circulation. The long-running television series and its remake “Battlestar Galactica” include a band of a war against the highly evolved cylon robots, while they search to find the long lost colony of Earth. Scientists studying geological records have seen that there is a magnetic reversal every 400,000 years or so. Facts about Terrestrial Planets for Kids : Of all of the terrestrial planets, Earth is the densest and Mars is the second densest. Terrestrial planets (also called telluric or rocky planets) are planets made up primarily of metals or silicate rocks which constitute most of Earth’s crust, asteroids, and rocky moons. We have thousands of satellites orbiting the Earth to study specific areas as well as the entire Earth as a whole. In the 1800s, when people first thought that there were canal-like features on the surface of Mars, they thought that these were the proof that intelligent alien species lived on the planet. Scientists believe that life not only developed but adapted and thrived on Earth because of our uniquely perfect distance from the sun and the gravitational effects that the moon had on the planet. The size of the Earth and the distance from the sun is critical to life on Earth. Interesting facts about the terrestrial planets In the solar system, there are four objects that are called the terrestrial planets: Mercury (the smallest), Venus and Mars, and Earth (the largest). Earth is an average distance of 93 million mi/150 million km from the sun or one AU (astronomical unit). At the surface we see colors such as gold, tan, and brown. If you were standing on Mars it would appear as a hazy red color. The 2014 novel that became the movie adaptation in 2015 of “The Martian” involved a botanist that was left stranded on Mars and his struggle to survive while he awaits rescue. During the photosynthesis process, plants consume carbon dioxide and give off oxygen. Terrestrial planets (Earth sized and smaller) are rocky worlds, composed of rock, silicate, water and/or carbon. The landscape is rather dusty and the temperatures on the surface can reach as high as 880 degrees F/471 degrees C. The Earth is made up of four main layers, beginning with the planet’s inner core which is enveloped by the outer core, then the mantle, and finally the crust. Mercury is the first of the four terrestrial planets. The exosphere of Mercury is made up of mostly oxygen, sodium, hydrogen, helium, and potassium.Mercury’s magnetic field is relative to the equator of the planet. There could be up to 40 billion such exoplanets in the Milky Way. The outer core is made up of iron and nickel fluids. The slow rotation of Venus makes the magnetic field a lot weaker than on Earth. There may be other areas that have water ice, however, the orbit of MESSENGER didn’t include probing the southern pole. Earth’s atmosphere protects us from meteoroids and radiation from the Sun. Each of the terrestrial planets has a central core made mostly of iron. There are a lot of science fiction writers that have used the smallest planet in our solar system for inspiration for their novels. Extreme temperatures and pressures on Mercury and Venus are too intense to be conducive to life as we know it to adapt or thrive. Terrestrial planets have metallic cores of mostly iron, with rocky mantles and crusts. The surface of Mars is a reddish-brown color due to the rusting process of the surface minerals. The terrestrial planets in our solar system orbit relatively close to the Sun, this gives them their other name; the “Inner Planets” Earth is the most hospitable to life. Are you in the mood to learn more about the Solar System? This movement creates the volcanoes. The Kepler mission sent back data that indicates that there are terrestrial planets around other stars outside of our solar system. Television has also picked up on the idea of intelligent creatures on Mars with the 1966 series “My Favorite Martian.”. The inner core is around 759 mi/1,221 km in radius and is a solid sphere of nickel and iron metals. The four innermost planets of our solar system (Mercury, Venus, Earth and Mars) are called the “terrestrial” planets. Jupiter has more than double the mass of all the other planets combined. These are rocks rich in silicon and oxygen. The terrestrial plants have a central core, a rocky mantle, and a solid crust. Wedged in between the outer core and the crust is the mantle which is the thickest of all of the layers. The layer above the core is called the “mantle” and is usually made of silicate rocks. The outer planets are Jupiter, Saturn, Uranus, and Neptune. It’s the molten state that creates the currents of energy as the planet rotates. They are all ‘terrestrial planets’, which means that they are made of rock and metal, rather than gas or ice.All seven of TRAPPIST-1’s planets orbit TRAPPIST-1 more closely than Mercury orbits the sun. This lock is what causes the moon to always be facing the same way to Earth. Instead it has a thin “exosphere” which consists of atoms that are created with meteoroids hit the surface and the solar wind catches them and blasts them upwards. In our solar system, there are four terrestrial planets, which also happen to be the four closest to the sun: Mercury, Venus, Earth and Mars. The list of authors include: Isaac Asimov, C.S. Mars is also home to the largest known volcano in the solar system called Olympus Mons. Even the comic strip “Calvin and Hobbes” has mention of Mercury. Terrestrial planets exist around other stars. One idea of the source of the name is that the word “Earth” is an old Germanic word that really just means “the ground.”. They must also have a hard surface and possible atmosphere. In Ancient Greek, the word “Phobos” translates to “flight,” and “Deimos” translates to “fear.”. This is true the bulk structure and composition but not the surface conditions or the atmosphere. It’s the Earth’s magnetic field that causes the compass needles to point to the North Pole, no matter which way that you turn. # 3. Venera 15 1983: Soviet twins Venera 15 and 16 orbiters, the mission was to use radar to create a detailed map of the surface of Venus with a resolution of 1-2 km or around 1 mile. It’s believed that the planets were formed around 4.5 billion years ago. The magnetic field of Earth is incredibly powerful and also plays a big part in protecting our planet from the effects of solar wind. Each time you look up to the sky and see a star you are looking at a sun in another galaxy. These satellites observe the atmosphere, glaciers, oceans, and the solid earth. In film called “Sunshine”, released in 2007, a spacecraft called the “Icarus II” orbits around Mercury to meet up with the Icarus I. Here are some interesting facts about our solar system. They are also called internal, solid-state, opposing the external gas giant planets. Even though Earth and Venus share similar size and seem to have similarly-sized iron cores, Earth’s faster rotation allows us a stronger magnetosphere. Venus has acid rain that is created in the clouds within its atmosphere. Galileo 1989: The orbiter included ten science instruments as well as an atmospheric probe to study Jupiter, its moons, and the magnetosphere as it orbited. A terrestrial planet is mostly made of rock Earth is the "original" terrestrial planet.When astronomers started understanding the kinds of planet they extended the term to include our nearest rocky neighbours: Mercury, Venus and Mars.. While many of our planets have played a part in legend and stories, Mercury seems to have been a focus of our collective imaginations. Terrestrial Planet A terrestrial planet is a planet which has solid surfaces and is primarily composed of silicate racks and/or metals. The inner planets are Mercury, Venus, Earth, Mars. The slowing down process will have an effect on the length of our days, however, it will take around 140 million years before we see a day change from 24 hours to 25 hours. Asteroids; Asteroid Types. Above the rocky mantle is the crust made up of iron, magnesium, aluminum, calcium, and potassium. The polar caps of Mars has been found to have frozen water, and other evidence is showing that liquid water may exist below the surface of the planet. Planet Facts Interesting Planet Facts Mercury – The smallest and fastest planet, it zips around the Sun in only 88 Earth days.. Venus – Venus’ thick atmosphere makes it the hottest planet in our solar system.. Earth – The only planet in our solar system with liquid water on the surface.. Mars – Mars was a wet and warm planet billions of years ago. The surface is relatively warm for an asteroid, the average surface temperature is about 235 degrees Kelvin or minus 36 degrees Fahrenheit or minus 38 degrees Celsius. NASA, India, and ESA (European Space Agency) have spacecraft orbiting above Mars. The atmosphere acts as a protective barrier, shielding the Earth from the impacts of meteoroids as many burn up before they have a chance to hit Earth’s surface. Outer Planets (or Gas giants) –the planets outside of the asteroid belt. The hottest planet … The images that Mariner took covered around 45% of the surface of Mercury and prompted interest to launch later missions. Earth; Mercury; Venus; Mars; Gas Giants. The solar wind is a constant stream of charged particles that the sun ejects. The animated television show “Invader Zim,” has Mercury being changed into a giant ship prototype spaceship by an extinct group of Martians. These lifeforms live in conditions that were previously thought to be uninhabitable, and they are called “extremophiles.”. Facts about space (Part 1: The terrestrial planets) Posted on February 5, 2016 by discoverscience1 . Learn about Terrestrial Planets: Definition & Facts about the Inner Planets for kids Deimos is around half the size of Phobos and its orbit is 2 ½ times farther away. They are also called ‘inner planets’. There are 4 known terrestrial planets in our solar system – Mercury, Venus, Earth and Mars , which are all inner planets and one terrestrial dwarf planet, Ceres, located in … The Moon is similar, but has a much smaller iron core. However, it is thought that Mars may have once had life and there is a possibility that life may still be on Mars today. One of the most distinctive features on Mars is its “channels.” These channels look like they could have been made by running water. The planet Venus has “domes” that are thought to have been created when lava pushed rock to the surface. In recent years, astronomers have designed a new class called the “dwarf planets.” These are smaller worlds, not quite big enough to be considered a standard planet, and include Pluto. It is also thought that at one time, Mars may have had an atmosphere strong enough to support water on the planet’s surface. Mars has a thin atmosphere and Venus has a thick atmosphere. It has a distinctive red color and was therefore associated with battles and war and named after the Roman god of war. The makeup of the terrestrial planets consists of a mostly iron central core and a next layer called the mantle usually consisting of silicate rocks that are rich in oxygen and silicon. It’s the iron in the Martian dirt that has oxidized or rusted that causes it to look red. Earth isn’t too hot and isn’t too cold, and this is often called the “Goldilocks distance.” Our moon has created the tides on Earth, which in turn has helped life to develop. The core is made up of iron, nickel and sulfur. “Titan A.E.,” the animated feature shows Earth’s destruction by a species of aliens, however, a well-placed planet builder then recreates the planet and all of the species that live on it. Two of the craters are named for Dr. Seuss, famous author of children’s books and Alvin Ailey, a pioneer in dance. Mercury is the smallest of the terrestrial planets. Rocky mantles and crusts is fiddler crab slow rotation of Venus as destroyed or abandoned: similarly. ; Neptune ; dwarf planets Terra and Tellus in many tales, have! And things don ’ t have one dwarf planet in our Milky.... Of all the way to the Sun—Venus, Earth, and brown MESSENGER! 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