Explanation: Why do many galaxies appear as spirals? A striking example is M101, shown above, whose relatively close distance of about 22 million light years allow it to be studied in some detail. Recent evidence indicates that a close gravitational interaction with a neighboring galaxy created waves of high mass and condensed gas which continue to circle the galaxy. These waves compress existing gas and cause star formation. One result is that M101, also called the Pinwheel Galaxy, has several extremely bright star-forming regions (called HII regions) spread across its spiral arms. M101 is so large that its immense gravity distorts smaller nearby galaxies.

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Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr'

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.

Publikacii s klyuchevymi slovami: M 101 - spiral'naya struktura - spiral'naya galaktika - Oblasti zvezdoobrazovaniya - oblasti ionizovannogo vodoroda Publikacii so slovami: M 101 - spiral'naya struktura - spiral'naya galaktika - Oblasti zvezdoobrazovaniya - oblasti ionizovannogo vodoroda
Sm. takzhe: M51: prilivnye potoki i oblako ionizovannogo vodoroda NGC 300: galaktika iz zvezd Spiral'naya galaktika s peremychkoi NGC 1365 ot teleskopa "Dzheims Vebb" Spiral'naya galaktika NGC 6744 M106: spiral'naya galaktika so strannym yadrom NGC 247 s druz'yami Licom k NGC 6946 Vse publikacii na tu zhe temu >>