Across
- 1. - a collection of gas, dust, stars, and solar systems that are held together by gravity
- 7. - the circular movement of an object around its center (like a top spinning)
- 10. - all of space and its contents (including planets, stars, galaxies, and all other forms of energy and matter)
- 11. - The moment that the moon orbits directly between the sun and the Earth
- 12. - the sun, the planets that orbit the sun, and other objects that orbit the sun
- 13. - the force by which all things with mass or energy (including planets, stars, galaxies, and light) are brought towards one another
- 16. - a moon outside our solar system
- 17. - to shine light on an object and make it visible
- 19. - the border between light and dark on the Moon
- 20. - something we observe to be similar over and over again
Down
- 2. - when the moon is completely dark
- 3. - the tendency of an object to remain at rest or unchanged
- 4. - the four parts of the year where weather, ecology, and number of daylight hours change as a result of Earth’s orbit around the sun
- 5. - the star that is the main source of light at the center of our solar system
- 6. - a moon phase that looks like less than half a circle from Earth
- 8. - the amount of time it takes for a planet to complete one orbit around a star or stars
- 9. - a planet outside our solar system
- 14. - the relative size of things
- 15. - a rocky sphere that travels around a planet
- 18. - the nearly circular path a smaller object (like the Moon) travels around a larger object like Earth)