Comet Hartley 2 will make its closest approach to Earth tomorrow, and is best viewed with binoculars or a low-magnification telescope.
Asteroid collision: The Hubble Space Telescope has spotted an odd X shape in our solar system's asteroid belt, in what could be the first image of an asteroid collision in space.
By the end of this month, astronomers expect to have found 500 planets beyond our solar system. The current count is 494, including one that may be inhabitable by humans.
Evidence from an ancient meteor strike on Mars indicates the presence of liquid water at some point in the Red Planet's ancient past.
Gliese 581g could be scanned for radio emissions. And its atmosphere could be observed for signs of chemicals produced by manufacturing.
Gliese 581g would be the first Earth-like planet found orbiting in a star's habitable zone. The new plant is located in a region where temperatures could sustain life and liquid water on its surface.
Humanity's search for signs of extraterrestrial life has largely focused on scanning the sky for radio signals. But if alien technological progress is anything like ours, ET might have already gone digital.
A new web site shows the Northern lights, also called the aurora borealis, live starting at 10 p.m. each night courtesy of the Canadian Space Agency. The prime northern lights viewing season is August through May.
Halley's Comet visited our inner solar system in 466 BC, where it was probably viewed by ancient Greek skywatchers.
Two Chinese satellites bumped into each other very gently, leaving analysts wondering what China is up to.