Science

3. a spot or patch that appears from time to time on the sun's surface, appearing dark by contrast with its surroundings.
5. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a trail of gas and dust particles pointing away from the sun.
8. a natural satellite of any planet.
9. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun
10. a small rocky body orbiting the sun
11. a unit of astronomical distance equivalent to the distance that light travels in one year

1. the curved path of a celestial object or spacecraft round a star, planet, or moon, especially a periodic elliptical revolution
2. the star round which the earth orbits
3. a celestial body orbiting the earth or another planet.
4. a celestial body moving in an elliptical orbit round a star
6. a small body of matter from outer space that enters the earth's atmosphere
7. the sun together with the group of celestial bodies that are held by its attraction and revolve around it
8. a piece of rock or metal that has fallen to the earth's surface from outer space as a meteor
12. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction