| A | B |
|---|
| doppler effect | Apparent shifts in color or sound, used to determine if an object is moving towards or away from Earth. |
| absolute magnitude | How bright a star actually is. |
| absorption spectrum | Type of spectrum used to study the gas components of stars. |
| apparent magnitude | How bright a star appears when viewed from Earth. |
| milky way | The name of the galaxy where Earth is located. |
| white dwarf | The glowing remains of a small or medium mass star. |
| astronomical unit | How astronomers measure the distance to nearby stars. |
| black hole | The final stage of the most massive stars, not even light escapes. |
| protostar | A contracting cloud of gas and dust, almost a star, but fusion has not started. |
| constellation | Patterns of stars in the sky. |
| helium | The product of nuclear fusion |
| blue | This color star has the highest surface temperature. |
| red | This color star has the lowest surface temperature. |
| solar flares | The most explosive events that occur on the sun. |
