Science

"Solar System"

1. Sun
1. Corona
2. Chromosphere
3. Photosphere
4. Core
2. Inner Planets
   1. Mercury
   2. Venus
   3. Earth
   4. Mars
3. Outer Planets
   1. Jupiter
   2. Saturn
   3. Uranus
   4. Neptune
4. Star Cluster
   1. Constellations
5. Galaxies
   1. Spiral
   2. Elliptical
   3. Irregular
   4. Starburst
   5. Milky Way