Solar System

2. is a natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
4. an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity is not massive enough to cause thermonuclear fusion and has cleared its neighbouring region of planetesimals.
8. a spot or patch that appears from time to time on the sun's surface, appearing dark by contrast with its surroundings.
11. large numbers of these, ranging enormously in size, are found between the orbits of Mars and Jupiter
12. it is a moon, planet, or machine that orbits a planet or star.
13. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
14. As it falls toward a planet, the resistance—or drag—of the air on the rock makes it extremely hot.

1. it is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases.
3. the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
5. a unit of astronomical distance equivalent to the distance that light travels in one year
6. a star in the center of the solar system
7. a piece of rock or metal that has fallen to the earth's surface from outer space
9. it is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity.
10. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.