Across
- 3. the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets. The planets of the solar system are (in order of distance from the sun) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
- 5. a ball of hot gas you see at night
- 7. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution
- 10. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
- 11. a unit of astronomical distance equivalent to the distance that light travels in one year
- 12. a force that attracts thing towards bigger things
- 14. a small rocky body orbiting the sun.
Down
- 1. a big rock in space that orbits planets
- 2. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
- 4. 149.6 million kilometers used to measurer distances within the Solar System or around other stars
- 6. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
- 8. a galaxy that has a generally elliptical shape and that has no apparent internal structure or spiral arms.
- 9. a galaxy that has no said shape or size
- 13. our home planet
- 15. the center star of our galaxy