Log In or Register
This shot is actually composed of 51 individual Hubble exposures, in addition to elements from images from ground-based photos. The giant spiral disk of stars, dust, and gas is 170,000 light-years across or nearly twice the diameter of our galaxy, the Milky Way. M101 is estimated to contain at least one trillion stars with approximately 100 billion of these stars similar to our Sun in terms of temperature and lifetime. M101 lies in the northern constellation Ursa Major at a distance of 25 million light-years from Earth.
Credit: NASA/Hubble Heritage Archives.