Explanation: Why do many galaxies appear as spirals? A striking example is M101, shown above, whose relatively close distance of about 27 million light years allows it to be studied in some detail. Observational evidence indicates that a close gravitational interaction with a neighboring galaxy created waves of high mass and condensed gas which continue to orbit the galaxy center. 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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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 galaxy - spiral arms - spiral'naya galaktika - Spiral'nye vetvi galaktik Publikacii so slovami: M 101 - spiral galaxy - spiral arms - spiral'naya galaktika - Spiral'nye vetvi galaktik
Sm. takzhe: Licom k NGC 1232 Raskruchivaya M51 Triplet L'va Portret NGC 1055 M102: vid sboku na diskovuyu galaktiku Vid na M106 Ob'ekt Hoaga: pochti ideal'naya kol'ceobraznaya galaktika Vse publikacii na tu zhe temu >>