| A | B |
|---|
| galaxy | a large group of stars, gas, and dust |
| bluish-white | color of the hottest stars |
| star | a hot glowing sphere of gas that produces energy by fusion |
| sunspot | a cooler, dark area on the sun's surface |
| actual brightness | the amount of light a star really produces |
| aurora | solar flares interacting with the Earth's magnetic field |
| red | color of the coolest stars |
| corona | outer layer of the sun, seen during an eclipse |
| Milky Way | galaxy containg the Earth |
| elliptical galaxy | type of galaxy that is football shaped |
| apparent brightness | amount of light received on Earth from a star |
| supernova | explosion of a massive star |
| prominences | violent eruptions on the sun that are U-shaped |
| nebula | large cloud of dust and gas where stars are born |
| irregular galaxy | least common with all kinds of shapes and sizes |
| spiral galaxy | spiral shaped |
| core | center of the sun |
| fusion | process where a star gets its solar energy |
| Star's apparent brightness depends on | distance, size and temperature |
| Local Group Cluster | contain many types of galaxies including the Milky Way galaxies |
| Spiral galaxy contains _____ stars. | young |
| Solar flares take place on the ______ of the sun. | photosphere |
| gravity | hold a galaxy together |
| solar flares affect _______ on Earth. | radio reception |
| Northern Lights | light show caused by solar radiation entering the Earth's atmosphere |
| Hydrogen | used up early in a star's life through fusion |
| light years | measures distance in space |
| Main sequence stars | the most plentiful in space |
| spectrum | a star's "fingerprint" showing a star's composition |
| Star's temperature can be estimated by the star's ________. | color |
| Arms of spiral galaxies are made of __________. | dust and stars |
| the sun revolves around _________. | the galactic center |
| yellow stars | average temperature |
