Across
- 3. A regular, repeating path that one object in space takes around another one.
- 4. An invisible force that pulls everything down to the ground
- 6. Planets that have a solid core but a very thick atmosphere made of swirling gas such as hydrogen and helium.
- 7. The amount of matter in an object.
- 8. Anything that takes up space and can be weighed.
- 9. The measurement of how tightly packed a material is.
- 11. A massive collection of stars, gas, dust, and other matter held together by gravity.
- 12. Planets that orbit the sun and are made mostly of rock & metal creating a solid, rocky surface.
- 14. pull An invisible force that attracts objects with mass towards each other.
- 15. A non-artificially created object that obits around a planet, dwarf planet, or a smaller solar system body.
Down
- 1. An object that is human-built and intentionally launched into orbit using a rocket.
- 2. Much smaller, round planets that do not have a clear orbit around a star.
- 5. The study of the universe and everything outside of the Earth’s atmosphere including planets, stars, galaxies, and comets.
- 10. The amount of space inside a 3D object.
- 13. An object in space that must orbit a star, be large enough so its own gravity molds it into a spherical shape, and have a clear orbit around a star.