Solar System

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Across
  1. 5. An envelope of gases that surround a planet.
  2. 10. A celestial body made of ice and rock that orbits the Sun. When a comet nears the Sun a coma and tail of gases and dust can be seen.
  3. 12. The branch of science that studies outer space, celestial bodies, and the universe.
  4. 14. is a celestial body made of rock and metal that orbits the Sun. Asteroids can vary in size from a few feet across to hundreds of miles.
  5. 17. A measure of distance used for outer space. One AU is equal to 149.6 million kilometers which is the mean distance from the center of the Sun to the center of the Earth.
  6. 19. A measure of length that equals the distance light travels one year in a vacuum. It is about 5.8 trillion miles.
  7. 22. An instrument used to view objects in outer space.
  8. 23. A large celestial object that has become rounded due to its gravity and has cleared is nearby region of other smaller objects. Planets in the solar system include Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
  9. 25. The area of gases and dust that form around a comet as it passes by the Sun.
  10. 27. The universe is everything that exists including the stars, planets, matter, energy and time.
  11. 30. An area in space with gravity so intense even light cannot escape its pull. Black holes are formed when massive stars collapse.
  12. 32. A large planet that is not composed mostly of rock, but primarily of gas. There are four gas giants in the Solar System including Jupiter, Saturn, Uranus, and Neptune.
  13. 33. A small rocky object that orbits the Sun that has broken off from a comet or asteroid.
  14. 34. A stream of charged particles that is constantly flowing from the Sun.
Down
  1. 1. The galaxy that contains the Solar System.
  2. 2. A large ring of millions of icy objects that exists outside the orbit of Neptune.
  3. 3. The process by which two or more atoms are joined together to form a larger atom. This process occurs inside stars and produces huge amounts of energy.
  4. 4. A large cloud of dust in space. The dust in nebulae often forms stars and planets.
  5. 6. A meteoroid that has entered the Earth's atmosphere is called a meteor.
  6. 7. A huge explosion caused when a star collapses on itself.
  7. 8. When one celestial body blocks the light of the Sun from another. In a solar eclipse, the Moon blocks the light of the Sun from the Earth. In a lunar eclipse, the Earth blocks the light of the Sun from the Moon.
  8. 9. A dark area on the Sun caused by cooling from electromagnetic activity within the Sun.
  9. 11. System - The Solar System consists of the Sun and all the objects that orbit around it including the planets, asteroids, comets, and other objects.
  10. 13. A grouping of stars that form a pattern in the sky when viewed from Earth.
  11. 15. The path a celestial object takes around a star or planet.
  12. 16. A system consisting of a large number of stars bound together by gravity.
  13. 18. A giant ball of hot gas and plasma that generates huge amounts of energy through nuclear fusion.
  14. 20. A meteor becomes a meteorite when it reaches the ground.
  15. 21. An natural object that exists outside the Earth's atmosphere. Examples include stars, planets, asteroids, comets, and meteoroids.
  16. 24. A natural or artificial object that is in orbit around a planet.
  17. 26. A person who is specially trained to travel into outer space.
  18. 28. An area between the orbits of Mars and Jupiter where millions asteroids orbit the Sun.
  19. 29. The branch of science that studies the origin and nature of the universe.
  20. 31. A celestial body that is large enough to become rounded from its own gravity, but has not cleared its orbital region of other objects.