| A | B |
|---|
| A distinct combination of stars | Constellations |
| Astronomers study the stars | Astronomers |
| Astrologers are those who falsely believe that you tell the future by the stars | Astrologers |
| A point straight above your head | Zenith |
| A measure of the brightness of the star | Magnitude |
| Absolute magnitude is the actual brightness of a star. If all the stars were lined up side by side, we would be able to see the actual brightness of each star. Apparent magnitude is the brightness as it appears to us on earth. One star may look brighter to us because it is closer than another star. | two types of magnitude |
| Luminosity, Temperature, Color, Size, and composition | Classifying stars |
| this is 93,000,000 miles which is the average distance from the earth to the sun. TH distance between the planets and the sun are measured in AUs. | Astronomical unit |
| this is the distance light travels in one year. The is what scientists use for the distance between suns. | Light Years |
| is a star that flares up to several times it's normal magnitude then returns to normal | nova |
| a star that has exploded | supernova |
| clouds of gas and dust in the universe. It is believed that they come from stars that have exploded or gone supernova. | nebulas |
| are groups of millions of stars along with dust, gases, and everything else in space. | galaxies |
| spiral, barred spirals, irregular, and eliptical | types of galaxies |
| appear as a single star but are really made of thousands of closely spaced stars. | Globular clusters |
| are groups of hundreds to thousands of stars held together by gravity and have the same proper motion. Open clusters are a group of hundreds of stars spread far apart in no specific order or shape. | Star Clusters |
| have the appearance of moving together or orbiting each other. After years of tracking, they may seem to be close but really are not. | double stars |
| When stars they are observed to orbit each other. Stars that do orbit around each other. | binary stars |
| are a group of hundreds of stars spread far apart in no specific order or shape. | Open Clusters |
| Unbright nebulas | Dark nebulas |
| Lighter, colorful nebulas | Bright nebulas |
| circular nebulas | Planetary nebulas |
