Across
- 4. Jupiter, Saturn, Uranus, Neptune
- 6. a ring of rocky debris (asteroids)
- 8. states that after the sun formed, the solar wind blew the nebula (gas and dust) away from the sun and this gas and dust swirled and created a new star and other planets and astronomical bodies
- 10. a celestial body made of ice and dust that travels in an elliptical orbit around the sun
- 12. metallic rocky bodies that orbit the sun but do not have their own atmosphere
- 13. a cloud of dust and gases in space
- 14. similar to planets except they have an unusual orbit or it orbits in an area with other objects
Down
- 1. a landed meteor on Earth's surface that hasn't totally burned up
- 2. an astronomical body that orbits one or more stars, has a spherical shape and its own gravity
- 3. a small piece of rock or metal that travels through the solar system in no particular path and collides with gas particles once in Earth's atmosphere and ends up vaporizing its surface until it's much smaller
- 5. a unit used to measure distances in space (1 AU = 150 million km, which is the average distance between the Sun and Earth)
- 7. system the sun and all the planets and other celestial objects
- 9. Mercury, Venus, Earth and Mars
- 11. the distance that a beam of light travels through space in 1 year (= 9 000 billion km or 63 000 AU)