| A | B |
|---|
| Milky Way Galaxy | Group of stars to which our solar system belongs |
| Apparent magnitude | How bright a star looks |
| Black Hole | Region in space with tremendous gravity, caused by the collapse of a huge star |
| White dwarf | Small, white, hot, dense star that remains after a nova |
| Light-year | Distance that light travels in one year |
| Neutron star | Very small, very dense star that remains after a supernova |
| Nova | Brilliant explosion of a collapsed red giant |
| Fusion | Process by which particles combine to form a new particle |
| Magnitude | Brightness of a star |
| Universe | Everything that exists |
| Red giant | Star that has expanded after using up its hydrogen |
| Supergiant | One of the largest stars, formed when a star expands after using up its hydrogen; larger than a red giant |
| Galaxy | Group of billions of stars |
| Supernova | Brilliant explosion of a collapsed supergiant |
| Nebula | Cloud of gas and dust in space |
| Absolute magnitude | How bright a star actually is |
| Constellation | Pattern of stars seen from Earth |
