Unit 1 Vocabulary

123456789101112131415161718192021222324252627
Across
  1. 1. , All of space and everything in it, including stars, galaxies, and planets.
  2. 4. , A range of wavelengths of light or other electromagnetic radiation.
  3. 5. spectrum , All types of electromagnetic radiation, including light, radio waves, and X,rays.
  4. 8. , The point in a planet’s orbit where it is closest to the Sun.
  5. 10. , A large cloud of gas and dust in space; often where new stars form.
  6. 15. , The distance between two peaks in a wave; used to identify different types of electromagnetic waves.
  7. 17. Unit (AU) , The average distance from Earth to the Sun; used to measure distances in our solar system.
  8. 20. , Small building blocks of planets formed from dust and gas.
  9. 22. , The distance light travels in one year; used to measure distances in space.
  10. 25. system , The Sun and all the objects that orbit it, including planets, moons, asteroids, and comets.
  11. 26. disk , A disk where planets form around a young star.
  12. 27. , The point in a planet’s orbit where it is farthest from the Sun.
Down
  1. 2. fusion , The process that powers stars; atoms combine to form a new element and release energy.
  2. 3. , A massive explosion that occurs when a star dies.
  3. 6. , A huge system of stars, gas, and dust held together by gravity; we live in the Milky Way galaxy.
  4. 7. , A large object that orbits a star and has cleared other objects from its orbit.
  5. 9. , A shift in the light from distant galaxies toward the red end of the spectrum, showing they are moving away.
  6. 11. disk , A rotating disk of gas and dust surrounding a new star.
  7. 12. , The apparent shift in position of a nearby object when viewed from different angles.
  8. 13. , A model of the solar system where the Sun is at the center.
  9. 14. , The path an object takes as it moves around another object in space.
  10. 16. Microwave Background (CMB) , Weak radiation left over from the Big Bang.
  11. 18. nebula , A cloud of gas and dust from which the solar system formed.
  12. 19. Bang theory , The idea that the universe began from a single point and has been expanding ever since.
  13. 21. giant , A large planet made mostly of gases like Jupiter and Saturn.
  14. 23. planet , A rocky planet like Earth, Mercury, Venus, or Mars.
  15. 24. , An older model where Earth is at the center of the universe.