Across
- 3. particles from comets, asteroids, and other bodies that are generally smaller than 0.1mm in diameter
- 6. a U.S. government agency that is responsible for science and technology related to air and space
- 7. a system of two stars that are gravitationally bound to and in orbit around each other
- 9. the gravitationally bound system of the Sun and the objects that orbit it
- 10. a belt around the heavens extending 9° on either side of the ecliptic, the plane of Earth's orbit and of the Sun's apparent annual path
- 12. rocky remnants left over from the early formation of our solar system about 4.6 billion years ago
- 13. a region of space between the orbits of Mars and Jupiter where most of the asteroids in our Solar System are found orbiting the Sun
Down
- 1. a large spacecraft in orbit around Earth
- 2. a celestial body that -orbits the sun, has enough mass to assume a nearly round shape, has not cleared the neighborhood around its orbit and is not a moon
- 3. the outermost part of the Sun's atmosphere
- 4. An unidentified form of matter that accounts for galaxies rotating faster than their visible mass should cause
- 5. frozen leftovers from the formation of the solar system composed of dust, rock, and ices
- 8. a spherical rocky body, probably with a small metallic core, revolving around Earth in a slightly eccentric orbit at a mean distance of about 384,000 km (238,600 miles)
- 11. About 13.8 billion years ago, the universe sprang into existence