| A | B |
|---|
| constellations | patterns of stars in the sky |
| pulsar | a neutron star that produces pulses of radio waves |
| protostar | the earliest stage in a star's life |
| wavelength | distance between the crest of one wave of elctromagnetic radiation and the crest of the next one |
| quasar | a type of galaxy |
| binary star | a star system containing two stars |
| apparent magnitude | a star's brightness as seen from Earth |
| eclipsing binary | a star system in which one star blocks the light from another |
| radio telescope | a device used to detect radio waves from objects in space |
| nebula | a giant cloud of gas and dust in the galaxy |
