This is M51, the Whirlpool Galaxy, created from 79 images @ 4-minutes exposure each for more than 5 hours total exposure time. This was taken with a William Optics FLT132, a 900mm focal length telescope and a good light pollution filter.
The graceful, winding arms of the majestic spiral galaxy M51 appear like a grand spiral staircase sweeping through space. They are actually long lanes of stars and gas laced with dust. Such striking arms are a hallmark of so-called grand-design spiral galaxies. In M51, also known as the Whirlpool galaxy, these arms serve an important purpose: they are star-formation factories, compressing hydrogen gas and creating clusters of new stars.
Some astronomers think that the Whirlpool’s arms are particularly prominent because of the effects of a close encounter with NGC 5195, the small, yellowish galaxy at the outermost tip of one of the arms. The compact galaxy appears to be tugging on the arm, the tidal forces from which trigger new star formation. The small galaxy has been gliding past the Whirlpool for hundreds of millions of years.
The red represents infrared light as well as hydrogen within giant star-forming regions. The blue color can be attributed to hot, young stars while the yellow color is from older stars.
Discovered by Charles Messier in 1773, M51 is located 31 million light-years from Earth. (Description Source: NASA)
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