22 April 2011, 06:00 AM ET
The bright yellow star Arcturus is putting on a dazzling show in the night sky.
21 April 2011, 04:00 PM ET
A spiral galaxy is being distorted by the gravitational pull of a neighbor in a new photo from the Hubble Space Telescope.
20 April 2011, 11:18 AM ET
A spectacular time-lapse video of the landscapes and skyscapes of El Teide, a huge volcanic peak in the Canary Islands.
18 April 2011, 07:03 PM ET
Luke Skywalker's home planet of Tatooine is a vividly realized alien world, but it may be missing one key detail: black plants.
18 April 2011, 12:36 PM ET
The famed supernova Cassiopeia A may have been visible in 1630, five decades earlier than thought.
15 April 2011, 01:31 PM ET
Skywatchers can observe the first full moon of the spring season in the Northern Hemisphere Sunday (April 17).
15 April 2011, 07:00 AM ET
New images reveal photogenic, but puzzling, tangled cosmic filaments.
14 April 2011, 07:48 AM ET
The first galaxies formed much earlier than previously thought — just 200 million years after the universe's birth.
13 April 2011, 02:57 PM ET
Astronomers today are lucky, with a plethora of evidence from the Big Bang readily available.
08 April 2011, 01:19 PM ET
Astronomer Joe Rao recounts an amazing trip to the Southern Hemisphere to view a whole new sky.
07 April 2011, 02:03 PM ET
NASA's planet-hunting Kepler space observatory is showing it's a multi-purpose instrument.
05 April 2011, 08:07 PM ET
Astronomers discovered a time delay between two jets of gas from a young star.
01 April 2011, 06:46 PM ET
Now is a good time to see the Big Dipper stars and constellation Ursa Major.
31 March 2011, 10:32 AM ET
Sub-brown dwarfs – a mid-point between planets and stars – could prove fertile grounds for extraterrestrial life.
30 March 2011, 03:54 PM ET
Saturn is back in the evening sky and here's how to see it.
30 March 2011, 01:01 PM ET
Astronomers have taken the pulse of red giant stars using starquakes.
30 March 2011, 07:00 AM ET
The star cluster NGC 371 glows pink and red in a new photo from ESO's Very Large Telescope.
29 March 2011, 04:52 PM ET
Spring is here, and with it a seasonal star formation is front and center in the night sky.
24 March 2011, 05:05 PM ET
A Japanese space observatory has revealed the clearest view yet of the dusty Perseus galaxy cluster 250 million light-years from Earth.
23 March 2011, 10:01 AM ET
Astronomers may have detected a new candidate for the coldest known star.
16 March 2011, 11:14 AM ET
A close-up view of a busy star-birthing region shows the dramatic effects newborn stars have on the surrounding gas and dust.
11 March 2011, 06:22 PM ET
The "eye" is really the environment around a spiral galaxy called NGC 4151, which is 43 million light-years from Earth.
11 March 2011, 12:59 AM ET
A dying star has been caught brewing up a toxic mix of gases in deep space. A new Hubble Space Telescope photo shows the star, which is creating the Westbrook nebula.
10 March 2011, 12:26 PM ET
The slim crescent moon will pass the Pleiades star cluster tonight.
09 March 2011, 06:33 PM ET
Astronomers have spotted an ancient galaxy cluster that appears surprisingly young. The galaxy cluster formed nearly 3 billion years after the birth of the universe, but is surprisingly mature, scientists say.
08 March 2011, 03:48 PM ET
Astrophysicist Stephen Hawking and Apollo 11 moonwalker Buzz Aldrin have teamed up to advance humanity's future beyond Earth. Hawking and Aldrin hope to support future exploration.
03 March 2011, 02:01 PM ET
A longstanding question in astronomy is what creates cosmic rays, the super-speedy space particles that can zip right through the Earth.
02 March 2011, 07:58 AM ET
The dusty galaxy NGC 247 is 1 million light-years closer to Earth than once thought.
02 March 2011, 07:12 AM ET
The giant black hole at the heart of galaxy Markarian 231 kicks up a flood of material — behavior that starves the black hole and limits star formation.
28 February 2011, 01:45 PM ET
Findings from NASA's Kepler telescope suggest planets are a dime a dozen in our galaxy.
25 February 2011, 06:00 AM ET
NASA's WISE space telescope took its last photo of the sky on Feb. 1, 2011.
23 February 2011, 05:46 PM ET
The ultradense core of an exploded star contains superfluids, a strange form of superconducting matter.
23 February 2011, 01:09 PM ET
One glance at the night sky shows that some stars are brighter than others. But how bright are they really?
17 February 2011, 09:01 AM ET
A stunning new photo from the Hubble Space Telescope shows newborn stars studding a spiral galaxy like bright blue jewels.
17 February 2011, 07:00 AM ET
Astronomical detectives have assembled a stellar lineup, identifying nearby stars that may come close enough to disrupt our solar system in the next billion years or so.
16 February 2011, 05:54 PM ET
A new study finds that galaxies need the dark matter equivalent of 300 billion suns for star formations.