| A | B |
|---|
| The bigger the star | the shorter it lives |
| Galaxy catigories | spiral, elliptical and irregular |
| the universe formed | 10 to 15 billion years ago |
| the hubble telescope | a reflecting telescope |
| betelguese | a star hotter than the sun |
| a room full of telescopes | an observatory |
| patterns of stars in the sky | constellations |
| a cluster of stars | a galaxy |
| the sun formed out of a | nebula |
| convex lense | a piece of transparent glass |
| apparent magnitude | a star's brightness seen from Earth |
| giant stars or supergiant stars | very large stars in the galaxy |
| binary stars | double stars |
| groups of two or more stars | star systems |
| pulsars | neutron stars |
| protostar | the earliest stage of a stars life |
| big bang | the explosion caused the expansion of the universe |
| white dwarf | the blue white hot core of a star that is left behind |
| quasars | a distant galaxy with a black hole at its center |
| universe | all of space and everything in it |
