Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.astronet.ru/db/xware/msg/1291234
Дата изменения: Mon Jul 29 23:29:00 2013
Дата индексирования: Sun Apr 10 12:55:02 2016
Кодировка:

Поисковые слова: hst
Hoags Object: A Strange Ring Galaxy
Astronomy Picture of the Day
    


Hoags Object: A Strange Ring Galaxy
<< Yesterday 28.07.2013 Tomorrow >>
Hoags Object: A Strange Ring Galaxy
Credit & Copyright: R. Lucas (STScI/AURA), Hubble Heritage Team, NASA
Explanation: Is this one galaxy or two? This question came to light in 1950 when astronomer Art Hoag chanced upon this unusual extragalactic object. On the outside is a ring dominated by bright blue stars, while near the center lies a ball of much redder stars that are likely much older. Between the two is a gap that appears almost completely dark. How Hoag's Object formed remains unknown, although similar objects have now been identified and collectively labeled as a form of ring galaxy. Genesis hypotheses include a galaxy collision billions of years ago and the gravitational effect of a central bar that has since vanished. The above photo taken by the Hubble Space Telescope in July 2001 revealed unprecedented details of Hoag's Object. More recent observations in radio waves indicate that Hoag's Object has not accreted a smaller galaxy in the past billion years. Hoag's Object spans about 100,000 light years and lies about 600 million light years away toward the constellation of the Snake (Serpens). Coincidentally, visible in the gap (at about one o'clock) is yet another ring galaxy that likely lies far in the distance.

Follow APOD on: Facebook (Daily) (Sky) (Spanish) or Google Plus (Daily) (River)

January
February
March
April
May
June
July
August
September
October
November
December
 < July 2013  >
Mo Tu We Th Fr Sa Su
1234567
891011121314
15161718192021
22232425262728
293031



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: ring galaxy
Publications with words: ring galaxy
See also:
All publications on this topic >>