1 | Inner planets | | _____ | a cool giant star. |
2 | Solar eclipse | | _____ | a small piece of debris from a comet or asteroid in interplanetary space. |
3 | Asteroid | | _____ | the Moon's shadow falling on Earth, producing a region of darkness in daytime. |
4 | Lunar eclipse | | _____ | the primordial explosion of space at the beginning of time. |
5 | Outer planets | | _____ | the remains of a giant star that has collapsed on itself, so dense that light cannot escape from it. |
6 | Planet | | _____ | a group of stars that forms an identified pattern. |
7 | Meteor | | _____ | the shadow of the Earth falls on the moon, producing relative darkness of the full moon. |
8 | Meteoroid | | _____ | a dying star that has collapsed to an Earth-like size and is slowly cooling off. |
9 | Comet | | _____ | also known as a shooting star, the streak of light produced from a meteoroid. |
10 | Big Bang | | _____ | the planets close to the sun: Mercury, Venus, Earth and Mars. |
11 | Nebular Theory | | _____ | a large assemblage of stars, interstellar gas, and dust held together by gravity. |
12 | Constellation | | _____ | an imaginary sphere surrounding Earth to which the stars are attached. |
13 | Red Giant | | _____ | the name of the galaxy to which we belong. |
14 | Galaxy | | _____ | a small, rocky body that orbits the sun. |
15 | Star | | _____ | a mass of gas and plasma held together by its own gravity that produces its own light through thermonuclear reactions. |
16 | Light-year | | _____ | the distance light travels in one year. |
17 | Black hole | | _____ | a body composed of ice and dust that orbits the sun. |
18 | White dwarf | | _____ | the idea that the Sun and planets formed together from a cloud of gas and dust, a nebula. |
19 | Celestial sphere | | _____ | Jupiter, Saturn, Uranus, and Neptune. |
20 | Milky Way | | _____ | the major bodies orbiting the Sun that are massive enough to be spherical. |