Q3 Exam Review

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Across
  1. 2. as distance between two objects in space decreases the gravitational force _____________.
  2. 3. When the effect of the Moon and Sun's gravitational force is weakest because they form a right angle with the Earth in space.
  3. 6. as the mass of one (or both) objects in space decreases the gravitational force _______________.
  4. 8. When the effect of the Moon and Sun's gravitational force is strongest because they are aligned with Earth.
  5. 9. planets that are close to the sun orbit _________.
  6. 11. the distance that light can travel in a year, commonly used to measure distances between our solar system and other stars (or further)
  7. 13. A measurement of the average distance between Earth and the sun, any distance other than one means the object is that many times further from the sun than Earth.
  8. 14. the real brightness of a star that is not distance dependent
  9. 15. a large structure in space that is composed of billions of stars and star systems with a black hole at its center
  10. 18. a noncontact force that depends on the mass and the distance between two objects in space
  11. 19. the temperature of a star's photosphere determines what _________ it appears to be.
  12. 21. an event that can occur when the Earth is directly between the Sun and the Moon (Full Moon phase)
  13. 22. the current model of the solar system that puts the Sun at the center and has all other objects revolve around it.
  14. 23. an old model of the solar system that put the Earth at the center and had all other objects revolve around it.
Down
  1. 1. an effect that occurs when specific gases trap heat in a space (like a planet's atmosphere) and cause it to be warmer than it would be otherwise.
  2. 4. the outermost layer of the Sun's atmosphere, visible only during an eclipse.
  3. 5. the most visible portion of the sun
  4. 7. the brightness of a star as it appears from Earth that changes with distance
  5. 10. another name for orbit, the movement of an object around the sun
  6. 12. the spinning of a planet or star on its axis that can be observed by watching features of its surface move across the visible face.
  7. 16. the measure of how far apart waves are from one another (how large they look)
  8. 17. an event that can occur when the moon is directly between the Earth and the Sun (New Moon phase)
  9. 20. a measure of how strong the gravitational force of a planet is on an object