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Astronomy Picture Of the Day (APOD)
![Лунная пыль и клейкая лента](http://images.astronet.ru/pubd/2005/10/12/0001208530/dustdt_apollo17_big.preview.jpg)
1.05.1999
Why is the Moon dusty? On Earth, rocks are weathered by wind and water, creating soil and sand. On the Moon, the long history of micrometeorite bombardment has blasted away at the rocky surface creating a layer of powdery lunar soil or regolith. This lunar regolith could be a scientific and industrial bonanza.
![Ударные волны на Солнце](http://images.astronet.ru/pubd/2005/10/12/0001208527/moreton_halpha_eit.preview.jpg)
30.04.1999
On September 24, 1997 a shock wave blasted across the surface of the sun at speeds of 250 to 600 kilometers per second. On planet Earth, observer Barry Reynolds photographed the expanding shock front (left) in the light emitted by hydrogen atoms at the solar surface.
![NGC 2266: Старое скопление в Новом Каталоге](http://images.astronet.ru/pubd/2005/10/12/0001208525/ngc2266_credner_big.preview.jpg)
29.04.1999
The New General Catalog of star clusters and nebulae really isn't so new. In fact, it was published in 1888 - an attempt by J. L. E. Dreyer to consolidate the work of astronomers William, Caroline, and John Herschel along with others into a useful single, complete catalog of astronomical discoveries and measurements.
![Солнечные часы для Марса](http://images.astronet.ru/pubd/2005/10/10/0001208494/sundial_mars_big.preview.jpg)
28.04.1999
When Mars Surveyor arrives at Mars in 2002, it will carry a sundial. Even though batteries and a solar array will power the Mars Surveyor Lander, the sundial has been included to allow a prominent public display of time.
![Встречайте комету Ли!](http://images.astronet.ru/pubd/2005/10/10/0001208491/lee_gg.preview.jpg)
27.04.1999
Another large snowball is falling toward the Sun. Comet Lee was discovered two weeks ago by Steve Lee (AAO) in Australia, and is expected to brighten as it approaches the inner Solar System. Comet...
![Каталог USNO-A2.0: оцифрованное небо](http://images.astronet.ru/pubd/2005/10/10/0001208490/sky_usnoa2_big.preview.gif)
26.04.1999
Here lie 526,230,881 of the brightest stars known. The US Naval Observatory has deployed their monster Precision Measuring Machine to digitize photographic plates covering the whole sky and creating the above map. Yellow corresponds to 150,000 stars per square degree, while dark blue corresponds to only 500 stars per square degree.
![Мимас - маленькая луна с большим кратером](http://images.astronet.ru/pubd/2005/10/10/0001208489/mimas_vg1_big.preview.jpg)
25.04.1999
Mimas is one of the smaller moons of Saturn but shows one of the largest impact craters. In fact, if the impact had been much greater, it would have disrupted the entire satellite. The large crater has been named Herschel after the 1789 discoverer of Mimas, Sir William Herschel.
![Барсум](http://images.astronet.ru/pubd/2005/10/10/0001208488/barsoom.preview.gif)
24.04.1999
"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.
![Тень Ио](http://images.astronet.ru/pubd/2005/10/07/0001208430/ioshadowc_hst_big.preview.jpg)
23.04.1999
Orbiting Jupiter once every 43 hours, the volcanic moon Io cruises 500,000 kilometers above swirling, banded cloud-tops. Orbiting Earth once every 1.5 hours, the Hubble Space Telescope watched as Io accompanied by its shadow crossed the face of the reigning gas giant planet in 1997.
![Где же ν Андромеды?](http://images.astronet.ru/pubd/2005/10/06/0001208414/upsand_credner_big.preview.jpg)
22.04.1999
Astronomers recently announced the detection of three large planets orbiting the star Upsilon Andromedae - the first planetary system known to orbit a normal star other than our Sun. These planets were not directly photographed but found through a Doppler technique developed to use large telescopes to search nearby stars for wobbling planetary signatures.
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