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Astronomy Picture Of the Day (APOD)
![Рея: второй по величине спутник Сатурна](http://images.astronet.ru/pubd/2006/11/11/0001217615/rhea2_vg2_big.preview.gif)
5.12.1999
Rhea is the second largest moon of Saturn, behind Titan, and the largest without an atmosphere. It is composed mostly of water ice, but has a small rocky core. Rhea's rotation and orbit are locked together (just like Earth's Moon) so that one side always faces Saturn.
![Эллипс для посадки Марс-Поляр-Лендера](http://images.astronet.ru/pubd/2006/11/11/0001217616/mplellipse_mgs_big.preview.jpg)
4.12.1999
South is up in this recent composite color picture of Mars Polar Lander's target region near the Martian South Pole taken on November 28. Imaged by the orbiting Mars Global Surveyor's wide angle camera, the area covered is 105 kilometers across with the expected landing ellipse superposed.
![Южное полушарие Марса](http://images.astronet.ru/pubd/2006/11/11/0001217617/marssouthpole_mola_big.preview.jpg)
3.12.1999
This topographical map of the southern hemisphere of Mars was generated using data from the Mars Orbiter Laser Altimeter (MOLA). Flying on the Mars Global Surveyor spacecraft, MOLA has bounced a laser beam off the Martian surface over 200,000,000 times producing a wealth of detailed elevation measurements.
![Болид Леонид 1999 года](http://images.astronet.ru/pubd/2006/11/11/0001217618/leonid99b_danielsen_big.preview.jpg)
2.12.1999
Most Leonid meteoroids, the bits of comet debris which produce the annual Leonid meteor shower, range from a mere millimeter to a centimeter in diameter. Yet these cosmic grains of sand and gravel can put on quite a spectacular show. How can something so small generate so much light?
![Посадка на южный полюс Марса](http://images.astronet.ru/pubd/2006/11/11/0001217619/mplland_mgs_big.preview.gif)
1.12.1999
The latest invader from Earth, the Mars Polar Lander (MPL) spacecraft, is scheduled to touch down on the Red Planet's surface on Friday, December 3rd. If all goes well the robotic explorer will...
![Хенице 70: сверхпузырь в Большом Магеллановом Облаке](http://images.astronet.ru/pubd/2006/11/12/0001217633/n70_vlt_big.preview.jpg)
30.11.1999
Massive stars -- upwards of tens of times the mass of the Sun - profoundly affect their galactic environment. Churning and mixing the clouds of gas and dust between the stars, they leave their mark on the compositions and locations of future generations of stars and star systems.
![Арки и джеты в Хербиго-Аро 34](http://images.astronet.ru/pubd/2006/11/12/0001217634/hh34_vlt_big.preview.jpg)
29.11.1999
Some features of HH-34 are understood -- some are not. At the core of Herbig-Haro 34 lies a seemingly typical young star. This star, though, somehow ejects energetic "bullets" of high-energy particles, appearing as red streaks toward the lower right of the this image.
![Под облаками Венеры](http://images.astronet.ru/pubd/2006/11/12/0001217635/venus2_mag_big.preview.gif)
28.11.1999
If the thick clouds covering Venus were removed, how would the surface appear? Using an imaging radar technique, the Magellan spacecraft was able to lift the veil from the Face of Venus and produce this spectacular high resolution image of the planet's surface. Red, in this false-color map, represents mountains, while blue represents valleys.
![Сбежавшая звезда](http://images.astronet.ru/pubd/2006/11/12/0001217636/runaway_eso_big.preview.jpg)
27.11.1999
Runaway stars are massive stars traveling rapidly through interstellar space. Like a ship plowing through the interstellar medium, runaway star HD 77581 has produced this graceful arcing bow wave or "bow shock" - compressing the gaseous material in its path.
![Вулкан на Ио. Горячая лава Пеле](http://images.astronet.ru/pubd/2006/11/12/0001217637/pelelava_gal_big.preview.jpg)
26.11.1999
Glowing hot lava from the heart of Io's volcano Pele is visible in this false-color infrared composite image. It was recorded last month during the Galileo spacecraft's close flyby of the Jovian moon.
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