| A | B |
|---|
| Parallax | the amount of apparent shift of an object (star) which occurs when we view distant objects from 2 diffrent points. This method works for distances of stars up to 100 LY away. |
| Red shift | One way of determining the distance of a star. Can be used for stars that are greater than 7m LYA. The Amount of red shift determines the distance. More red shift, the more the distance. |
| Brightness | 2 types: Absolute and Apparent. |
| Absolute Brightness | the actual luminosity of a star. The lower the number the brighter the star. |
| Apparent Brightness | Brightness of a star as viewed from earth. |
| Neutron Star | smallest most dense star. 1 cm3 weighs 1 Billion tons. Smaller than earth. |
| White Dwarf | 2nd smallest stars. Average size compares to Earth. What our sun will become in death. |
| Main Sequence Stars | Medium size stars. 90% of all stars are this size; includes our Sun. |
| Giant Stars | Stars 10-100x larger than our sun. |
| SuperGiant Stars | Largest of the 5 sizes. Inludes stars that are 100x larger or greater than our Sun. Ex. include Betelgeuse and Rigel. |
| Hertzsprung Russell Diagram | Graph that plots the surface temperature of a star against its absolute Brightness. Provides us with size, color, temp., and ages of the stars. |
| Annie "Jump" Cannon | Came up with a method of classifying stars in the late 1800's. O,B,A,F,G K, and M. |
| Spectroscope | Gives us the spectrum of stars that tells us the composition, distance and type of star. |
