The constellation Ursa Major holds this nearly face on spiral galaxy.
A diameter of over 170,000 light-years and approx 27
million-light years from here. M101 has a magnitude of 7.9 and
one I'm particulary happy with. This image is 'only' 60 images
stacked and I'm sure we will get this one again in the near future.
This latest image of M101 comes after the type 1a supernova. The
last image was before it so unfortunately, we don’t have it
here. The latest thoughts for 1a supernova occur when a white
dwarf siphons material from a neighboring or companion star. At
some point, enough material gathers on the dwarf, that it starts fusing
hydrogen into helium. Before long a run away effect kicks in and
the star explodes! Such explosions can release enough energy it
can outshine its host galaxy. Astronomers use the brightness of
the type 1a supernova for judging distance as the explosion are pretty