THE SOLAR SYSTEM

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Across
  1. 2. Are planets are massive planets usually with a primary composition of gases or ice instead of solid matter such as rocks.
  2. 5. Star composed of 92.1% hydrogen atoms and 7.8% helium atoms, around which the planets gravitate; represents more than 99.8% of the solar system’s total mass.
  3. 8. Earth’s only natural satellite; devoid of water and atmosphere, it displays a highly uneven surface.
  4. 11. A planet known most for its rings and has numerous moons.
  5. 15. is a rock that falls to Earth from space. The vast majority of it are pieces of asteroids.
  6. 16. Are objects that enter Earth’s atmosphere from space. But these are typically pieces of comet dust no larger than a grain of rice—burn up before reaching the ground.
  7. 17. Are planets made up primarily of metals or silicate rocks which constitute most of Earth’s crust, asteroids, and rocky moons.
  8. 18. A sphere of gas massive enough to generate light and heat through nuclear reactions that transform hydrogen into helium in its core.
  9. 20. The closest planet to the sun and is only a bit larger than Earth's moon.
  10. 22. Grouping of stars and interstellar matter linked together by gravitation; each comprises an average of 100 billion stars.
  11. 23. A planet that is terribly hot, even hotter than Mercury. The atmosphere is toxic and the pressure at the surface would crush and kill you. Scientists describe the planet's situation as a runaway greenhouse effect.
Down
  1. 1. It is unlike other planets in many respects. It is smaller than Earth's moon. Its orbit carries it inside the orbit of Neptune and then way out beyond that orbit.
  2. 3. It is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body.
  3. 4. It's huge and is the most massive planet in our solar system. It’s a mostly gaseous world, mostly hydrogen and helium. Its swirling clouds are colorful due to different types of trace gases.
  4. 6. it's the name that we use to describe the collection of all the things that exist in space. It is made of many millions of millions of stars and planets and enormous clouds of gas.
  5. 7. it's an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighboring region of planetesimals.
  6. 9. A rocky objects smaller than planets that are left over from the formation of our solar system.
  7. 10. It is a path of a body revolving around an attracting center of mass, as a planet around the Sun or a satellite around it.
  8. 12. It is a cold, dusty planet. The dust, an iron oxide, gives the planet its reddish cast. Scientists think it was once wet and warm, though today it’s cold and desert-like.
  9. 13. It is a water world, with two-thirds of the planet covered by ocean. It’s the only world known to harbor life, its atmosphere is rich in life-sustaining nitrogen and oxygen.
  10. 14. Formed at farther distances from the Sun, beyond what we call the frost or snow line and past the orbits of Mars and Jupiter, where temperatures were low enough for water to freeze.
  11. 16. it's the galaxy that contains the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye.
  12. 19. It is known for strong winds — sometimes faster than the speed of sound. it's far out and cold. The planet is more than 30 times as far from the sun as Earth and it has a rocky core.
  13. 21. It's an oddball. The only giant planet whose equator is nearly at right angles to its orbit — it basically orbits on its side. Methane in its atmosphere gives a blue-green tint. It has numerous moons and faint rings.