Who knew there were so many different types of galaxies. There could be as many as 100 to 200 billion galaxies in the observable universe. Here are some of the most fascinating.
How Humans Could Live on Saturn's Moon Titan (Infographic) By Karl Tate | 3/12/15 Conditions on Saturn's moon Titan.
Basically the success bible
JPL | The Lives of Stars and the Search for Habitable Worlds
This gives great information on the construction of the Hubble Space Telescope. There are great visual aids such as diagrams and other graphics that deconstruct the telescope. #hubbletelescope #space #astronomy