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Astronomy Picture Of the Day (APOD)
On the Origin of Gold
5.04.2001
Where did the gold in your jewelry originate? No one is completely sure. The relative average abundance in our Solar System appears higher than can be made in the early universe, in stars, and even in typical supernova explosions. Some astronomers now
Distant Supernova Dark Energy
4.04.2001
Light from a star that exploded over 10 billion light-years away is revealed in the panel at the lower right, a cosmic snapshot of the most distant supernova. The ancient stellar detonation was detected...
New Stars Destroying NGC 1748
3.04.2001
NGC 1748 cannot contain all the new stars it has formed. The young stars, the most massive of which are bright blue, emit so much energy they are pushing out and dispersing the gas and dust that comprise this star forming nebula.
Aurora Over Clouds
2.04.2001
Aurorae usually occur high above the clouds. The auroral glow is created when fast-moving particles ejected from the Sun impact air molecules high in the Earth's atmosphere. An oxygen molecule, for example, will glow in a green light when reacquiring an electron lost during a collision with a solar particle.
Americans Defeat Russians in First Space Quidditch Match
1.04.2001
A historic first Space Quidditch match came to a spectacular conclusion last night as astronaut Michael Lopez-Alegria caught the Golden Snitch to give the Americans a hard fought victory over the Russians. "The Russians...
Barsoom
31.03.2001
"Yes, I have been to Barsoom again ..." begins John Carter in Edgar Rice Burroughs' 1913 science fiction classic "The Gods of Mars". In Burroughs' novels describing Carter's adventures on Mars, "Barsoom" is the local inhabitants' name for the Red Planet. Long after Burroughs' stories were published, Mars continues to inspire Earthdwellers' interests and imagination.
Equinox 1
30.03.2001
Twice a year, at the Spring and Fall equinox, the Sun rises due east. In an emphatic demonstration of this celestial alignment, photographer Joe Orman recorded this inspiring image of the Sun rising exactly along the east-west oriented Western Canal, in Tempe, Arizona, USA.
Aurora Alaskan Style
29.03.2001
Have you checked the space weather report lately? With a coronal mass ejection (CME) headed our way and an immense sunspot group tracking across the solar photosphere, skygazers should be on the alert.
Chandra Deep Field
28.03.2001
Officially the Chandra Deep Field - South, this picture represents the deepest ever x-ray image of the Universe. One million seconds of accumulated exposure time with the orbiting Chandra X-ray Observatory went in to its making.
Swiss Cheese Like Landscape on Mars
27.03.2001
Why do parts of the south pole of Mars look like swiss cheese? This little-understood landscape features flat-topped mesas nearly 4 meters high and circular indentations over 100 meters across. Since this swiss-cheese topography...
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