Countless stars dot the night sky. Learn how these celestial objects form, how they are classified 由 brightness and temperature, and what happens when they die.
Many amazing 太空 discoveries have been made over the years, from finding out that the Earth orbits the Sun, to discovering there is a lot 更多 to dwarf planets than we thought...
Highlights of the discoveries of the SOHO and TRACE satellites, featuring NASA solar scientists Alex Young and Dawn Meyers, describing how both satellites view the sun in their own unique way
