Space

4. The amount of light emitted by a star
5. An object orbiting in the Lagrange points of another (larger) object.
6. A cloud of dust and gas in space illuminated by one or more stars.
8. A stone meteorite that contains no chondrules.
9. A system of two stars that revolve around a common centre of gravity.
10. The surface of the sun or other celestial body projected against the sky.
12. A tiny particle of rock or dust that burns away in the earth's atmosphere.
15. The two points at which the sun crosses the celestial equator in its yearly path in the sky.
16. A term used to describe an exceptionally bright meteor.
17. The bright visible surface of the sun.

1. The angle between a body's equatorial plane and orbital plane.
2. A process by which dust and gas accumulate into larger bodies such as stars and planets.
3. An extremely bright meteor.
7. When an object moves in the reverse sense of normal motion.
11. A natural or artificial body in orbit around a planet.
13. Cooler areas of the sun's surface than surrounding areas.
14. A comet outside the solar system