Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5455  ·  NGC 5457  ·  NGC 5461  ·  NGC 5471
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M101, Peter Hannah
M101
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M101

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M101, Peter Hannah
M101
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M101

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Description

A face-on spiral galaxy, M101 is about 21 million light years away in Ursa Major, near the stars Alkaid and Mizar.

The  galaxy is about 170,000 light years  across. As can be seen from the image, M101 has numerous H-II regions glowing with the red light of the H-α spectral line at 656.3 nm. The neutral hydrogen has been ionized by radiation from nearby hot young blue stars in the spiral arms.

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M101, Peter Hannah