Across
- 2. as distance between two objects in space decreases the gravitational force _____________.
- 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.
- 6. as the mass of one (or both) objects in space decreases the gravitational force _______________.
- 8. When the effect of the Moon and Sun's gravitational force is strongest because they are aligned with Earth.
- 9. planets that are close to the sun orbit _________.
- 11. the distance that light can travel in a year, commonly used to measure distances between our solar system and other stars (or further)
- 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.
- 14. the real brightness of a star that is not distance dependent
- 15. a large structure in space that is composed of billions of stars and star systems with a black hole at its center
- 18. a noncontact force that depends on the mass and the distance between two objects in space
- 19. the temperature of a star's photosphere determines what _________ it appears to be.
- 21. an event that can occur when the Earth is directly between the Sun and the Moon (Full Moon phase)
- 22. the current model of the solar system that puts the Sun at the center and has all other objects revolve around it.
- 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. 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.
- 4. the outermost layer of the Sun's atmosphere, visible only during an eclipse.
- 5. the most visible portion of the sun
- 7. the brightness of a star as it appears from Earth that changes with distance
- 10. another name for orbit, the movement of an object around the sun
- 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.
- 16. the measure of how far apart waves are from one another (how large they look)
- 17. an event that can occur when the moon is directly between the Earth and the Sun (New Moon phase)
- 20. a measure of how strong the gravitational force of a planet is on an object