Scientists can easily compute the distance between planets.
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Gravity binds the planets to the sun.
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This chapter will focus on the riddles of the planets.
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He is always writing about journey to other planets.
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I wonder if life exists on other planets.
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Is there life on other planets?
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The sun has nine planets.
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There are nine planets travelling around the sun, the earth being one of them.
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The earth is different from the other planets in that it has water.
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The earth is one of the sun's planets.
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The earth is one of the planets.
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The Earth, Mars and Jupiter are planets.
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Nine planets including the earth are moving around the sun.
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J. Kepler, astronomer and mathematician, made a study of planets and their movements.
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Astronomy deals with the stars and planets.
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Seen through a telescope, the planets take on a completely new appearance.
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The smaller planets hovering around the planet Jupiter reminded him of the guards surrounding a king when he walked outdoors, and Kepler called them satellites.
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Planets move around a fixed star.
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The planets revolve around the sun.
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Is there intelligent life on other planets?
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Can you tell me instead, why the planets on the screen are coloured the way they are?
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Planets are easy to identify because they don't twinkle like stars do.
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Are there any other planets on which life can exist?
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Do other planets exist, on which life can exist?
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He won't let you in unless you knock the ostinato rhythm from the Mars movement of Holst's The Planets suite.
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In 2006, the International Astronomical Union decided to create a new category for solar system objects called "dwarf planets", and Pluto was reclassified as a dwarf planet.
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Tom believes that life exists on other planets.
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My very educated mother just showed us nine planets.
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The planets and the stars insist on illuminating eager minds, being a guide among the darkness.
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If God had consulted me before embarking on the creation of the planets, I would have suggested a simpler system.
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The sun is the torch, the lamp of the universe; if it is situated in the central region it's because this is the best place to illuminate the planets.
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Planets don't emit light by themselves.
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The planets move round the sun in the same direction and nearly in the same plane.
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The Solar System has only eight planets now as Pluto, which was the ninth, has been reclassified as a dwarf planet.
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The Solar System has four terrestrial or telluric planets: Mercury, Venus, Earth, and Mars.
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There are many, many planets in the Milky Way which are just as big as Jupiter.
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Soon, the space agencies launched thousands of robot probes all over the Solar System to explore planets, moons, asteroids, and comets...
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Her education was so minimal that she could not even name the eight planets of our Solar System.
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Hundreds of extrasolar planets have been discovered.
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How many planets are there in the solar system?
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How many planets are discovered every year?
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The difference between Earth and the other planets is that Earth has water.
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Planets orbit the sun.
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I'm alone standing at the tip of the slow-dying year, the universe breack in waves at my feet, planets whirl about my head, rumpling my hair in the wind that rushes by, whithout giving an answer that would fill the abyss.
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To go on. No. It's enough. To go on weighted down with worlds countries cities. Crowds howling. Covered with climates hemispheres ideas memories. Among the spiderwebs of tombs and the conscious planets.
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My dream is to become a space-archaeologist and to explore extinct planets.
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Venus rotates in the opposite direction from most other planets in our Solar System.
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Mercury is the smallest of the eight planets in the Solar System.
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Exoplanets are planets that are outside the solar system.
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Panspermia, the idea that biotic matter infested planets from falling objects from space, became taught as fact by the 22nd century.
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It'll only be a matter of time before life on other planets will be discovered.
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Earth, Mars and Jupiter are planets.
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The planets circle the Sun.
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Man is a sun and his senses are his planets.
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Ancient cultures had a variety of explanations for what the stars and planets were, but nearly all of them believed in the possibility of life forms much different from those they saw on Earth.
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This evening I have seen Jupiter accompanied by three fixed stars, totally invisible by their smallness. . . . The planets are seen very rotund, like little full moons.
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Eight known planets and their moons, along with comets, asteroids, and other space objects orbit the Sun.
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Pluto has more in common with Triton, Neptune's largest moon, than it does with any of the eight planets in our solar system. Pluto is actually smaller than Triton.
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The words " solar system" refer to the Sun and all of the objects that travel around it. These objects include planets, natural satellites such as the Moon, the asteroid belt, comets, and meteoroids.
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Some astronomers believe the whole solar system formed from a single flat cloud of gas, while others believe it formed when a huge object passed near the Sun, pulling a stream of gas off of the Sun. Astronomers theorize the planets then formed from this gas stream.
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The planets in our solar system are classified as inner planets and outer planets.
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The planets in our solar system are classified as inner planets and outer planets.
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The planets in our solar system are classified as inner planets and outer planets.
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The inner planets, the closest to the Sun, are solid spheres of rock and include Mercury, Venus, Earth, and Mars.
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The outer planets are large gaseous spheres with rings and include Jupiter, Saturn, Uranus, and Neptune.
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Between the inner and outer planets is an asteroid belt.
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Venus is unusual because it rotates in a direction opposite that of all of the other planets.
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Venus rotates slowly on its axis in a clockwise direction, which is referred to as a "retrograde" rotation because it is the opposite of the seven other planets.
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Jupiter is so large that all of the other planets in the solar system could fit inside of it.
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Uranus is one of the smaller gas giants in our solar system, but it is still large enough to hold 64 planets the size of Earth.
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Neptune and Uranus are very much alike. They are both large gas planets that look like big blue-green balls in the sky.
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Astronomers think that if it were not for the giant planet Jupiter exerting its gravitational force on the asteroids in the belt, the inner planets would be constantly bombarded by large asteroids.
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Scientists believe that comets are made up of material left over from when the Sun and the planets were formed.
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The universe contains all of the galaxies, stars, and planets.
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Aristotle, who lived from 384 to 322 BC, believed the Earth was round. He thought Earth was the center of the universe and that the Sun, Moon, planets, and all the fixed stars revolved around it.
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Like most astronomers before him, Ptolemy believed the Sun, Moon, and other planets circled the Earth. He thought that each space body moved in a small circle (an epicycle) that was itself orbiting Earth.
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Newton explained the movement of orbiting planets as the result of motion along a straight line combined with the gravitational pull of the Sun. His laws are all based on the idea that nothing is naturally at rest. He reasoned that all heavenly bodies are constantly moving, with no limits on space and time.
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The International Ultraviolet Explorer provided information about physical conditions in the central regions of distant galaxies that may contain black holes. It also provided scientists with more knowledge of the physical conditions in very hot stars, the effect of solar winds on the atmospheres of the planets in our solar system, and the loss of mass from stars when stellar winds and flares occur.
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Mariner 10 was the first space probe to visit Mercury. It was also the first probe to visit two planets - Venus and Mercury.
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The Church taught that the Sun and all the planets revolved around Earth.
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Copernicus believed the Earth and other planets moved around the Sun.
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In March 1999, Marcy and Butler announced the detection of the first true other "solar system" in which they found evidence of 3 planets orbiting a single star. The star is called Upsilon Andromedae.
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The official names of planets and their moons are governed by the International Astronomical Union.
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The mass of the planets is calculated according to the law of universal attraction.
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There are 8 planets in our solar system: there's Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
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Since it is the oval track, the distance between the planets and the sun differs at times.
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All but one of 8 planets of the Sun lack life.
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“If you are an alien, how come you sound like you’re from the north?” “Lots of planets have a north!”
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Exoplanets are planets that orbit other stars than the Sun.
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The planets follow elliptical orbits.
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How many stars and planets are there in the universe?
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Venus is unusual because it spins the opposite direction as Earth and most other planets.
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Why are planets round? Why aren't they shaped like cubes, pyramids, or discs?
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Why are planets round?
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We know more about the moon and other planets than we do about some places on our home planet.
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According to Aristotle, the planets and stars were located in an unchanging region of the world called the aether.
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Just imagine: that star you're looking at right now has planets orbiting around it.
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Just imagine that there are planets orbiting all those stars.
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A lot of the stars in the night sky have planets orbiting them.
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The mission will help scientists investigate how planets formed and how life began, as well as improve our understanding of asteroids that could impact Earth.
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Astrobiologists think our best bet for finding life on other planets is to search for water.
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