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Astronomy Picture Of the Day (APOD)
Iapetus in Black and White
14.09.2007
Iapetus, Saturn's third largest moon, is a candidate for the strangest moon of Saturn. Tidally locked in its orbit around the ringed gas giant, Iapetus is sometimes called the yin-yang moon because...
NGC 7129 and NGC 7142
13.09.2007
This alluring telescopic image looks toward the constellation Cepheus and an intriguing visual pairing of dusty reflection nebula NGC 7129 (left) and open star cluster NGC 7142. The two appear separated by only half a degree on the sky, but they actually lie at quite different distances.
Six Rainbows Across Norway
12.09.2007
Have you ever seen six rainbows at once? They are not only rare to see -- they are a puzzle to understand. The common rainbow is caused by sunlight internally reflected by the backs of falling raindrops, while also being refracted at the air / water boundary.
A Scorpio Sky Spectacular
11.09.2007
If Scorpio looked this good to the unaided eye, humans might remember it better. Scorpio more typically appears as a few bright stars in a well known but rarely pointed out zodiacal constellation. To get a spectacular image like this, though, one needs a good camera, color filters, and a digital image processor.
Building Galaxies in the Early Universe
10.09.2007
What was the very early universe like? To help find out, astronomers pointed the Hubble Space Telescope between bright nearby objects to create one of the deepest images ever -- the Hubble Ultra Deep Field (HUDF). The resulting HUDF is like a jewel box of strange and distant galaxies.
The Great Basin on Saturns Tethys
9.09.2007
Some moons wouldn't survive the collision. Tethys, one of Saturn's larger moons at about 1000 kilometers in diameter, survived the collision, but sports today the expansive impact crater Odysseus. Sometimes called...
The Voyagers Message in a Bottle
8.09.2007
Launched thirty years ago, NASA's Voyager 1 and 2 spacecraft are now respectively 15 billion and 12.5 billion kilometers from the Sun, equivalent to about 14 and 11.5 light-hours distant. Still functioning, the Voyagers are being tracked and commanded through the Deep Space Network.
South Pole Lunar Eclipse
7.09.2007
The Moon was up continuously for 14 days in August -- when viewed from the South Pole. But during the total lunar eclipse on August 28, it circled only about 10 degrees above the horizon.
Time Tunnel
6.09.2007
Spiky stars are nearby, but fuzzy galaxies are strewn far across the Universe in this cosmic view. Spanning about 1/2 degree on the sky, the pretty picture is the result of astronomer Johannes Schedler's project to look back in time, toward a quasar 12.7 billion light-years away.
Aurigids from 47 000 Feet
5.09.2007
On September 1, Aurigid meteors filled the sky, in keeping with inovative predictions of an outburst from this historically tentative meteor shower. Astronomers flying at 47,000 feet on a dedicated mission to observer the outburst collected image data for this composite photo of the Aurigids' bright and colorful streaks.
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