Across
- 3. comes from collisions between asteroids, comets, meteoroids, and Kuiper belt objects.
- 5. a short-period comet visible from Earth every 75–76 years
- 6. a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units to approximately
- 10. composed of an icy, rocky core that has two tails that point away from the Sun.
- 12. a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars.
- 13. "dirty snowballs"
- 14. first described in 1950 by Dutch astronomer Jan Oort, is a theoretical concept of a cloud of predominantly icy planetesimals
- 15. An ion tail made of gases always points away from the Sun
Down
- 1. A small, rocky object from space that is heated up as it enters the Earth’s atmosphere.
- 2. larger meteoroids may strike the Earth’s surface to create a ??
- 4. consists of cosmic dust (small particles floating in outer space) that pervades the space between planets within planetary systems, such as the Solar System
- 7. more than half of the interplanetary dust particles in our solar system come from
- 8. a celestial body that lies mostly between Mars and Jupiter.
- 9. objects that orbit the Sun at a farther distance than Neptune.
- 11. any object whose orbit crosses Earth’s can collide with Earth