22 October 2012, 02:40 PM ET
Researchers had thought disks like our own Milky Way had been static for the last 8 billion years.
19 October 2012, 02:04 PM ET
A study of 544 star-forming galaxies observed by the Keck and Hubble telescopes shows that disk galaxies like our own Milky Way unexpectedly reached their current state long after much of the universe's star formation had ceased.
17 October 2012, 10:55 AM ET
The newly discovered Earth-size planet is alluring, but San Franciscans are wary about interstellar travel.
10 October 2012, 03:00 PM ET
NASA turned its Chandra X-Ray Observatory to planetary nebulas in our solar neighborhood (within 5000 light years). These objects are the remains of red giant stars that shed most of their mass as they condense into white dwarfs.
10 October 2012, 01:01 PM ET
A companion star pushing through expelled dust and gas around a red giant star created a spiral structure.
10 October 2012, 12:02 PM ET
Astronomers using the Atacama Large Millimeter Array have discovered a surprising spiral structure and spherical shell surrounding the red giant star R Sculptoris. The shape was probably caused by a hidden companion star orbiting the red giant.
10 October 2012, 10:40 AM ET
This stunning space wallpaper shows the Helix nebula, lies 650 light-years away, in the constellation of Aquarius.
05 October 2012, 11:41 AM ET
A glowing planetary nebula looks like a giant cosmic eye.
05 October 2012, 10:37 AM ET
What a difference 50 years can make. The European Southern Observatory got its start using giant film slides – blurry and inexact by modern standards. Today, high tech digital telescopes and sensors can capture dramatically more detail.
04 October 2012, 01:37 PM ET
These shape-shifting galaxies have taken on the form of a giant mask. The icy blue eyes are actually the cores of two merging galaxies, called NGC 2207 and IC 2163, and the mask is their spiral arms in this cool space wallpaper.
04 October 2012, 07:00 AM ET
Look up to see celestial wonders this week.
03 October 2012, 12:39 PM ET
The find could help explain why bigger galaxies have bigger central black holes.
27 September 2012, 12:18 PM ET
These cosmic conundrums will challenge your knowledge of our home galaxy.
18 September 2012, 07:00 AM ET
The image depicts the galaxy NGC 7090, which is 30 million light-years away.
17 September 2012, 06:32 PM ET
This new instrument on a telescope in Chile will map distant galaxies to attempt to unravel the mystery of dark energy.
17 September 2012, 12:28 PM ET
This new space wallpaper of the reflection nebula Messier 78 was captured using the Wide Field Imager camera on the MPG/ESO 2.2-metre telescope at the La Silla Observatory, Chile.
14 September 2012, 01:03 PM ET
In 1771, comet hunter Charles Messier cataloged 45 objects easily confused with comets. Over time that list grew to 110 nebulae, galaxies and star clusters. Amateur astronomers can observe them all in a single night around the vernal equinox (March).
14 September 2012, 07:30 AM ET
The night sky's autumn constellations follow the summer stars so closely they can be seen well before the air gets chilly.
12 September 2012, 10:34 PM ET
This cool space wallpaper shows the bright, young star left of center gives NGC 1999 its brightness.
12 September 2012, 03:02 PM ET
Photographer John Eklund captured over 260,000 images to create this stunning video of the majestic landscapes in and magnificent skies above the pacific northwest of the United States.
10 September 2012, 07:40 PM ET
The result is a fun offshoot of the online Galaxy Zoo project.
06 September 2012, 09:01 AM ET
An elliptical and a spiral galaxy are pictured together in this new portrait from the Hubble Space Telescope.
06 September 2012, 02:41 AM ET
The galaxy I Zwicky 18, originally thought to be a young galaxy, actually seems to have formed around the same time as most other galaxies in this space wallpaper.
05 September 2012, 12:07 PM ET
Two very different galaxies were captured together by the Hubble Space Telescope: Messier 60, a large, old, and extremely bright elliptical galaxy; and NGC 4647, a young, blue spiral galaxy.
05 September 2012, 06:00 AM ET
A star in the Messier 4 globular cluster appears to hold the secret of eternal youth.
04 September 2012, 03:33 PM ET
Delphinus the dolphin and Cetus the whale are on view now.
04 September 2012, 03:06 PM ET
This striking space wallpaper shows a beautiful yet peculiar pair of galaxies.
04 September 2012, 02:10 PM ET
This new image of Messier 4, one of more than 150 globular star clusters orbiting around our galaxy, was recently captured by the ESO's La Silla Observatory in Chile. The image reveals tens of thousands of ancient stars.
04 September 2012, 11:50 AM ET
This September skywatchers can catch a glimpse of four planets (Venus, Mars, Jupiter, and Saturn) as well as a visual trick in the constellation Capricornus that makes two stars look like one oddly enlongated star.
04 September 2012, 07:00 AM ET
The ripples in space-time predicted by Einstein look to be responsible.
29 August 2012, 01:12 PM ET
The graceful gravitational dance of two colliding galaxies can feed the supermassive black holes at their center, rearranging and heating up the gas within these galaxies as seen in this simulation.
29 August 2012, 11:26 AM ET
Far away from light pollution and high up in the Sierra Nevada mountain range, Yosemite National Park's stunning views of the night sky and majestic natural wonders attract astronomers, photographers and city dwellers from around the country.
29 August 2012, 07:01 AM ET
A number of night sky superlatives are overhead now.
29 August 2012, 06:01 AM ET
Astronomers found molecules of a simple form of sugar, known as glycolaldehyde, around a young star.
28 August 2012, 04:23 PM ET
Most stars come in pairs. NASA's Kepler space telescope has now confirmed a pair of planets orbiting a pair of stars about 5000 light years from Earth. So we see their light from long, long ago; but not so far away (& very much within our own galaxy)
28 August 2012, 09:30 AM ET
The brightest planet and the largest star are just the start of the night's sky's extreme objects.