The Solar System once had five giant gaseous planets rather than the four it has today. That's the conclusion from a computer simulation of the Solar System's evolution, which suggests the fifth giant was hurled into interstellar space some 4 billion years…
On Sept. 19th, the STEREO-SOHO fleet of spacecraft surrounding the sun detected six coronal mass ejections (CMEs). Two of the clouds rapidly dissipated. The remaining four, however, are still intact and billowing through the inner solar system. Click to view a movie of
As September begins, green Comet Garradd is gliding across the star fields of the Milky Way in the early evening sky. The icy visitor from the outer solar system is not yet visible to the naked eye, but it looks great through amateur telescopes.Astrophotographer
