Across
- 4. An object made up of ice and dust
- 6. The coldest season of the year
- 7. Rapid expansion of matter that started the universe
- 10. Has longer or shorter days
- 11. Same days and same nights
- 13. Burning gas held together by gravity
- 14. The branch of science that deals with celestial objects, space, and the physical universe
- 15. A force that attracts another body of mass
Down
- 1. The period from the vernal equinox to the summer solstice
- 2. A collection of 8 planets and their moons that orbit the sun
- 3. A small rocky body orbiting the sun
- 5. A rock that enters the earth's atmosphere
- 8. Holds billions of stars and plantes
- 9. The warmest season of the year
- 12. The 3rd season of the year