| A | B |
|---|
| 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. |
| nebula | All stars begin at this stage. |
| refracting telescope | An optical telescope that bends light to magnify the object. |
| radio telescope | large disk that receives long wavelengths outside of the visible spectrum. |
| astronomical unit | How astronomers measure the distance to nearby stars. |
| 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. |
| light year | The distance light travels in one year. |
