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Astronomy Picture Of the Day (APOD)
![Сезоны Сатурна](https://images.astronet.ru/pubd/2001/07/03/0001169673/saturnseasons_hst.preview.jpg)
2.07.2001
Soon it will be winter in Saturn's northern hemisphere. Since Saturn is tilted in its orbit around the Sun, it has seasons just like the Earth. When a hemisphere is tilted so that the Sun passes more directly overhead, summer occurs. Half an orbit later -- about 15 (Earth) years for Saturn -- winter occurs.
![Спиральная галакатика NGC 7742](https://images.astronet.ru/pubd/2001/07/01/0001169658/ngc7742_hst.preview.jpg)
1.07.2001
This might resemble a fried egg you've had for breakfast, but it's actually much larger. In fact, ringed by blue-tinted star forming regions and faintly visible spiral arms, the yolk-yellow center of this face-on spiral galaxy, NGC 7742, is about 3,000 light-years across.
![Водород, гелий и звездное скопление М10](https://images.astronet.ru/pubd/2001/07/01/0001169657/m10_crednerkohle.preview.jpg)
30.06.2001
Stars like the Sun use hydrogen for fuel, "burning" hydrogen into helium at their cores through nuclear fusion. But what happens when that hydrogen runs out? For a while, hydrogen burns in a shell surrounding the stellar core and the star expands to become a red giant.
![Ледяные вулканы на Марсе?](https://images.astronet.ru/pubd/2001/07/02/0001169666/marscones_mgs.preview.jpg)
29.06.2001
What causes these unusual cone-shaped features on Mars? Spanning an average of only 100 meters at the base, these small cones appear near massive Martian volcanoes such as Olympus Mons. Near the cones are also dry channels and eroded banks.
![Топография Марса](https://images.astronet.ru/pubd/2001/07/01/0001169655/marstopography_mola.preview.jpg)
28.06.2001
Mars has its ups and downs. Visible on the above interactive topographic map of the surface of Mars are giant volcanoes, deep valleys, impact craters, and terrain considered unusual and even mysterious. Particularly notable...
![Лунный свет, Марс и Млечный Путь](https://images.astronet.ru/pubd/2001/06/28/0001169601/MandM_Magrath.preview.jpg)
27.06.2001
Aloha and welcome to a breath-taking skyscape. In this celestial scene, a four day old Moon illuminates a dreamlike foreground while bright planet Mars (above center) rules and the Milky Way's cosmic clouds of stars and dust seem to stretch from horizon to horizon.
![Весь Марс](https://images.astronet.ru/pubd/2001/06/28/0001169613/allmars_mola.preview.jpg)
26.06.2001
From pole to pole, from east to west, this is all of Mars. The above picture was digitally reconstructed from over 200 million laser altimeter measurements taken by the Mars Global Surveyor spacecraft currently orbiting Mars.
![Яркая комета LINEAR](https://images.astronet.ru/pubd/2001/06/27/0001169588/c2001a2june20_garradd.preview.jpg)
25.06.2001
Brighter than ever expected, comet LINEAR -- you know, the one designated C/2001 A2 -- is a sight to see in southern skies. This comet LINEAR first brightened impressively in late March as its active nucleus began to fragment, prompting some speculation that the comet might soon break up completely.
![NGC 3132: Туманность Восьми Вспышек](https://images.astronet.ru/pubd/2001/06/26/0001169575/ngc3132_hst.preview.jpg)
24.06.2001
It's the dim star, not the bright one, near the center of NGC 3132 that created this odd but beautiful planetary nebula. Nicknamed the Eight-Burst Nebula and the Southern Ring Nebula, the glowing gas originated in the outer layers of a star like our Sun.
![Петля Лебедя](https://images.astronet.ru/pubd/2001/06/24/0001169537/CygnusLoop_hst.preview.jpg)
23.06.2001
The shockwave from a 20,000 year-old supernova in the constellation of Cygnus supernova explosion is still expanding into interstellar space. The collision of this fast moving wall of gas with a stationary cloud...
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