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Showing posts from January, 2017

The Ambiguously Galactic Duo

M81 and M82 are two galaxies hanging out in the constellation Ursa Major, the Big Dipper. M81, on the right, is also referred to as Bode's Galaxy (for its discoverer, Johann Elert Bode). M82, on the left, is also know as the Cigar Galaxy.

Here are the wacky things about images like this one...

(1) Every single star you see in this image is in our own galaxy. It's easy to think you're seeing individual stars in M81 and M82 but that's simply not the case. At 12 million light years away, the galaxies are fairly close to us but they're still much too far to be able to resolve individual stars. Also, while there are such things as rogue stars that get flung out of their home galaxies due to gravitational disturbances, it would be quite rare for one to show up in an amateur astronomer's image.

(2) If your monitor is bright enough and calibrated well, you can see a lot of fuzzy patches, each of which is another galaxy!

Don't look at them too closely... M81 harbors…