Spiral Galaxy M74

Messier 74, also called NGC 628, is a stunning example of a “grand-design” spiral galaxy that is viewed by Earth observers nearly face-on. Its perfectly symmetrical spiral arms emanate from the central nucleus and are dotted with clusters of young blue stars and glowing pink regions of ionized hydrogen (hydrogen atoms that have lost their electrons). These regions of star formation show an excess of light at ultraviolet wavelengths. Tracing along the spiral arms are winding dust lanes that also begin very near the galaxy’s nucleus and follow along the length of the spiral arms.

M74 is located roughly 32 million light-years away in the direction of the constellation Pisces, the Fish. It is the dominant member of a small group of about half a dozen galaxies, the M74 galaxy group. In its entirety, it is estimated that M74 is home to about 100 billion stars, making it slightly smaller than our Milky Way.

The spiral galaxy was first discovered by the French astronomer Pierre M├ęchain in 1780. Weeks later it was added to Charles Messier’s famous catalog of deep-sky objects.

Image credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona


Posted 1 year ago with 141 notes
Tagged:scienceM74Messier 74Spiral galaxystarsspacecosmosAstronomyastrophysicsastrophotography

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