Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2024 March 6
A starfield is shown with an unusual horizontal line 
segment running throug the middle. The segment is an
edge-on galaxy and many brown dust filaments are visible.
Please see the explanation for more detailed information.

M102: Edge-on Disk Galaxy
Image Credit: NASA, ESA, Hubble; Processing: Ehsan Ebrahimian

Explanation: What kind of celestial object is this? A relatively normal galaxy -- but seen from its edge. Many disk galaxies are actually just as thin as NGC 5866, the Spindle galaxy, pictured here, but are not seen edge-on from our vantage point. A perhaps more familiar galaxy seen edge-on is our own Milky Way galaxy. Also catalogued as M102, the Spindle galaxy has numerous and complex dust lanes appearing dark and red, while many of the bright stars in the disk give it a more blue underlying hue. The blue disk of young stars can be seen in this Hubble image extending past the dust in the extremely thin galactic plane. There is evidence that the Spindle galaxy has cannibalized smaller galaxies over the past billion years or so, including multiple streams of faint stars, dark dust that extends away from the main galactic plane, and a surrounding group of galaxies (not shown). In general, many disk galaxies become thin because the gas that forms them collides with itself as it rotates about the gravitational centre. The Spindle galaxy lies about 50 million light years distant toward the constellation of the Dragon (Draco).

Tomorrow's picture: not a distant galactic nebula


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