Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.astronet.ru/db/xware/msg/1160525
Дата изменения: Fri Sep 5 20:44:29 2003
Дата индексирования: Sun Feb 3 11:08:45 2013
Кодировка:

Поисковые слова: arp 220
Dusting Spiral Galaxies
Astronomy Picture of the Day
    


Dusting Spiral Galaxies
<< Yesterday 15.01.1998 Tomorrow >>
Dusting Spiral Galaxies
Credit & Copyright: W. Keel and R. White (U. Alabama), NASA
Explanation: How much dust is in spiral galaxies? Does it block out much of the starlight? Because astronomers rely on an accurate knowledge of galaxy properties to investigate a wide range of problems, like galaxy and quasar evolution and the nature of dark matter, answers to simple questions like this are key. This striking, detailed Hubble Space Telescope image of dust in the outer reaches of a foreground spiral galaxy (left) back lit by an elliptical galaxy offers an elegant approach to providing the answers. As expected, dust lanes in the foreground galaxy seem to be associated with spiral arms. But surprisingly, many dust regions are not completely opaque and the dust is more smoothly distributed than anticipated. This "overlapping" pair of galaxies is cataloged as AM1316-241 and is about 400 million light-years away in the constellation Hydra.

January
February
March
April
May
June
July
August
September
October
November
December
 < January 1998  >
Mo Tu We Th Fr Sa Su



1234
567891011
12131415161718
19202122232425
262728293031
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: dust - spiral galaxy
Publications with words: dust - spiral galaxy
See also:
All publications on this topic >>