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Astronomy Picture Of the Day (APOD)
![Меркурий: ад, покрытый кратерами](http://images.astronet.ru/pubd/2001/08/24/0001170508/merc2_m10.preview.jpg)
19.08.2001
Mercury's surface looks similar to our Moon's. Each is heavily cratered and made of rock. Mercury's diameter is about 4800 km, while the Moon's is slightly less at about 3500 km (compared with about 12,700 km for the Earth). But Mercury is unique in many ways.
![Фобос: обреченная луна Марса](http://images.astronet.ru/pubd/2001/08/27/0001170532/phobos_vik1_r1.preview.jpg)
18.08.2001
Mars, the red planet named for the Roman god of war, has two tiny moons, Phobos and Deimos, whose names are derived from the Greek for Fear and Panic. These Martian moons may well...
![Система 47 Большой Медведицы](http://images.astronet.ru/pubd/2001/11/28/0001173251/illustration_47uma_cook.preview.jpg)
17.08.2001
Watching and waiting, astronomers have uncovered the presence of more than 70 planets orbiting stars other than the Sun. So far almost all these extrasolar planets have crazy elongated orbits, lie uncomfortably close to their parent stars, or are found in bizarre, inhospitable systems.
![Центавр А: рентгеновское излучение активной галактики](http://images.astronet.ru/pubd/2001/09/11/0001170655/cena_cxo_g1.preview.jpg)
16.08.2001
Its core hidden from optical view by a thick lane of dust, the giant elliptical galaxy Centaurus A was among the first objects observed by the orbiting Chandra X-ray Observatory. Astronomers were not disappointed, as Centaurus A's appearance in x-rays makes its classification as an active galaxy easy to appreciate.
![Марс: трехмерные дюны](http://images.astronet.ru/pubd/2001/09/13/0001170676/dunes3d_mgs_c1.preview.jpg)
15.08.2001
Get out your red/blue glasses and treat yourself to this dramatic 3-D view of sand dunes on Mars! The field of undulating dunes is found in Nili Patera, a volcanic depression in central Syrtis Major, the most prominent dark feature on the Red Planet.
![Рентгеновское излучение из плоскости Галактики](http://images.astronet.ru/pubd/2002/01/10/0001174061/galplane_cxo_c1.preview.jpg)
14.08.2001
In February 2000, the orbiting Chandra X-ray Observatory spent 27 hours staring into the plane of our Milky Way galaxy. Its target was a spot in the small constellation Scutum, within the Milky Way's zone of avoidance where galactic gas and dust clouds block visible light, making a poor window for optical telescopes.
![Частица межпланетной пыли](http://images.astronet.ru/pubd/2001/09/19/0001170762/ipd_nasa.preview.jpg)
13.08.2001
The dust that pervades our Solar System is not the dust that pervades our homes. Solar System dust comes from comets and asteroids, whereas house dust is most likely lint or dead cells. Pictured above is a piece of interplanetary dust caught by a high-flying U2-type aircraft.
![Орлиные "яйца" в M16](http://images.astronet.ru/pubd/2001/09/21/0001170848/m16_hst.preview.jpg)
12.08.2001
Star forming regions known as "EGGs" are uncovered at the end of this giant pillar of gas and dust in the Eagle Nebula (M16). EGGs, short for evaporating gaseous globules, are dense regions of mostly molecular hydrogen gas that fragment and gravitationally collapse to form stars.
![Загадка в гамма-лучах](http://images.astronet.ru/pubd/2001/09/24/0001170898/un_egret.preview.jpg)
11.08.2001
Gamma rays are the most energetic form of light, packing a million or more times the energy of visible light photons. If you could see gamma rays, the familiar skyscape of steady stars would be replaced by some of the most bizarre objects known to modern astrophysics -- and some which are unknown.
![Летние Персеиды](http://images.astronet.ru/pubd/2001/09/25/0001170903/perseids97_rickjoe.preview.jpg)
10.08.2001
Like falling stardust, cast off bits of comet Swift-Tuttle hurtle through the upper atmosphere about this time each year as planet Earth passes near the comet's orbital path. For the northern hemisphere, this...
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