| A | B |
|---|
| Constellations | Patterns of stars in the sky |
| Visible light | Light you see with your eyes |
| Electromagnetic radiation | Energy that can travel through space |
| Wavelength | Distance between one crest to the next |
| Spectrum | Range of different colors with different wavelengths |
| Refraction telescope | Uses a convex lens to gather and focus light |
| Reflection telescope | Uses a mirror instead of an objective lens to focus and gather light |
| Radio telescope | Device used to detect radio waves in space |
| Observatory | Building with 2 or more telescopes |
| Spectrograph | Device that breaks light into colors and photographs the spectrum |
| Galaxy | Giant structure with hundreds of billions of stars |
| Universe | Space and everything in it |
| Light year | Distance that light travels in one year |
| Parallax | The apparent change in position of an object when you look at it from different places |
| Giant star | Very large star |
| Apparent magnitude | Stars brightness seen from earth |
| Absolute magnitude | Stars brightness if it were at a standard distance |
| H-R diagram | Graph that shows the relationship between surface temperature and brightness |
| Main sequence | Diagnal line in the center of the H-R diagram where most of the stars are located |
| Pulsar | A neutron star that sends out radio waves |
| Nebula | Large mass of gas and dust in space |
| Protostar | earliest stage of a star |
| white Dwarf | Hot blue -white core of a star |
| Supernova | Explosion of a dying star |
| Neutron star | material left behind from a explosion of a star |
| Black hole | Remains of a very large star which pulls in everything into a single point using gravity |
| Quasar | Old, distanct objects in space |
| Binary star | Star system that has 2 stars |
| Big bang | Initial explotion that results in the formation and expansion of the universe |
