"Astronomy is the science that studies the Earth, the Moon and other objects in space. It has helped us discover our place in the physical universe. It is still making discoveries." This landing page gives options for students and...

This site gives an overview of the Hubble Space Telescope program. It also gives details about the previous and current science instruments used in the program, and information about the mission operations and observations.

Supernovae are divided into two basic physical types, including a description of supernova types and how they are classified based on the existence of hydrogen spectral lines. Definitions of key terms are provided.

NASA site recounts the history of the Venus Transits that have occurred over the past centuries and the various descriptions astronomers have written about them.