Explanation: Galaxies are fascinating not only for what is visible, but for what is invisible. Grand spiral galaxy NGC 1232, recently captured in detail by the new Very Large Telescope, is a good example. The visible is dominated by millions of bright stars and dark dust, caught up in a gravitational swirl of spiral arms rotating about the center. Open clusters containing bright blue stars can be seen sprinkled along these spiral arms, while dark lanes of dense interstellar dust can be seen sprinkled between them. Less visible, but detectable, are billions of dim normal stars and vast tracts of interstellar gas, together wielding such high mass that they dominate the dynamics of the inner galaxy. Invisible are even greater amounts of matter in a form we don't yet know - pervasive dark matter needed to explain the motions of the visible in the outer galaxy. What's out there?

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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: dark matter - spiral galaxy - temnaya materiya - spiral'naya galaktika - Spiral'nye vetvi galaktik Publikacii so slovami: dark matter - spiral galaxy - temnaya materiya - spiral'naya galaktika - Spiral'nye vetvi galaktik
Sm. takzhe: M100: galaktika s regulyarnym spiral'nym uzorom Licom k NGC 1232 Raskruchivaya M51 Triplet L'va Portret NGC 1055 M102: vid sboku na diskovuyu galaktiku Vid na M106 Vse publikacii na tu zhe temu >>