Across
- 4. this is created when fusion begins in a protostar
- 5. motion gravity and inertia work together to make objects orbit
- 6. the attractive force between any two objects
- 10. the tendency of an object to resist a change in motion
- 12. ball of hot gas at the center of the accretion disk
- 14. the shape of objects in space that have enough gravity to pull its matter to the center
- 17. an object that orbits the sun and has cleared its orbit of space objects.
- 18. after the sun formed, the rest of the matter flattened
- 20. the rocky planets closest to the sun
- 22. when hydrogen atoms fuse together releasing a tremendous amount of energy
- 24. exploding star
- 25. when matter is pulled toward the center of an object.
- 26. the speed and direction of an object
- 27. a giant cloud of gas and dust held together by gravity
- 28. objects found between Mars and Jupiter
Down
- 1. (planetesimals) Gravity pulled small solid objects together to form bigger objects
- 2. the process of how the Solar System formed
- 3. an object that orbits the sun, but is too small to have enough gravity to clear its orbit of space objects.
- 7. the process when gravity pulls gas and dust together to form large objects
- 8. when the gravity of a massive object pulls another object into orbit
- 9. a big “dirty snowball” space object that orbits the sun. When it gets close it melts and a tail can be seen.
- 11. an asteroid that moves around the sun in front of or behind Jupiter in its orbit
- 13. this formed after the nebula’s contraction, it began to spin and flatten the material into a spinning disk
- 15. a meteor that doesn't totally burn up in the atmosphere and hits the ground.
- 16. dust and rocks in space
- 19. the gas giant planets beyond the asteroid belt
- 21. a natural satellite of a planet (orbits a planet)
- 23. when dust or rocks burn up in the atmosphere creating a “shooting star.”