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Astronomy Picture Of the Day (APOD)
![Вымеобразные облака над Олимпийской долиной](https://images.astronet.ru/pubd/2011/02/20/0001249949/mammatus_saal_900.preview.jpg)
20.02.2011
What's happened to these clouds? Normal cloud bottoms are flat because moist warm air that rises and cools will condense into water droplets at a very specific temperature, which usually corresponds to a very specific height. After water droplets form that air becomes an opaque cloud.
![Спиральная галактика NGC 2841 вблизи](https://images.astronet.ru/pubd/2011/02/20/0001249951/ngc2841c_hst_sm.preview.jpg)
19.02.2011
A mere 46 million light-years distant, spiral galaxy NGC 2841 can be found in the northern constellation of Ursa Major. This sharp view of the gorgeous island universe shows off a striking yellow nucleus and galactic disk.
![Планетарные туманности](https://images.astronet.ru/pubd/2011/02/18/0001249911/pn912035927_metsavainio900.preview.jpg)
18.02.2011
Cast off by dying sunlike stars, planetary nebulae are a brief but glorious final phase of stellar evolution. The gaseous shrouds are ionized by an extremely hot central source, the shrinking core of a star running out of fuel for nuclear fusion.
![Вспышка Х-класса](https://images.astronet.ru/pubd/2011/02/17/0001249891/SDO20110215_015332_900c_0193.preview.jpg)
17.02.2011
On Valentine's Day (ET) the Sun unleased one of its most powerful explosions, an X-class flare. The blast was the largest so far in the new solar cycle. Erupting from active region AR1158...
![Комета Темпель 1 с космического аппарата Стардаст-Некст](https://images.astronet.ru/pubd/2011/02/16/0001249871/tempel1_stardust_900.preview.jpg)
16.02.2011
No comet has ever been visited twice before. Therefore, the unprecedented pass of the Stardust-NeXT spacecraft near Comet Tempel 1 earlier this week gave humanity a unique opportunity to see how the nucleus of a comet changes over time.
![Туманность Северная Америка в инфракрасном свете](https://images.astronet.ru/pubd/2011/02/15/0001249841/northamerica_ir_900.preview.jpg)
15.02.2011
The North America Nebula can do what most North Americans cannot -- form stars. Precisely where in the nebula these stars are forming has been mostly obscured by some of the nebula's thick dust that is opaque to visible light.
![Туманность Розетка](https://images.astronet.ru/pubd/2011/02/14/0001249785/rosette_lula_900.preview.jpg)
14.02.2011
Would the Rosette Nebula by any other name look as sweet? The bland New General Catalog designation of NGC 2237 doesn't appear to diminish the appearance of this flowery emission nebula. Inside the nebula lies an open cluster of bright young stars designated NGC 2244.
![Подледный лов космических нейтрино](https://images.astronet.ru/pubd/2011/02/14/0001249784/deephole_icecube_900.preview.jpg)
13.02.2011
Scientists are melting holes in the bottom of the world. In fact, almost 100 holes melted near the South Pole are now being used as astronomical observatories. Astronomers with the IceCube Neutrino Observatory lowered into each vertical lake a long string knotted with basketball-sized light detectors. The water in each hole soon refreezes.
![Симеиз 147: остаток сверхновой](https://images.astronet.ru/pubd/2011/02/14/0001249783/SH2_240_NobuhikoMiki.preview.jpg)
12.02.2011
It's easy to get lost following the intricate filaments in this detailed mosaic image of faint supernova remnant Simeis 147. Also cataloged as Sh2-240 and seen towards the constellation Taurus, it covers nearly 3 degrees (6 full moons) on the sky.
![Цвета звезд Ориона](https://images.astronet.ru/pubd/2011/02/11/0001249732/OrionColors_hackmann900h.preview.jpg)
11.02.2011
What determines a star's color? Its temperature. Red stars are cool, with surface temperatures of around 3,000 kelvins (K), while blue stars are hotter and can have temperatures over 30,000 K. Our own lovely "yellow" Sun's temperature is a comforting 6,000 K.
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