File:Hubble's Hidden Galaxy.jpg
Were it not obscured by so much interstellar matter, the Hidden Galaxy would be one of the brightest galaxies in our sky. A relatively close galaxy, it is roughly 50,000 light-years across and billions of years old. Its face-on alignment makes it a prime target for possible supernova sightings, but so far, scientists have seen none.
Caldwell 5 was discovered in the early 1890s by William Frederick Denning, a British amateur astronomer who had practically no formal scientific training yet still managed to achieve a great amount of success in astronomy (discovering several comets, publishing more than a thousand scholarly articles, and winning the Gold Medal of the Royal Astronomical Society). The best time of year to look for Caldwell 5, which is located in the constellation Camelopardalis, is during late autumn and early winter in the Northern Hemisphere. In the Southern Hemisphere, only those located close to the equator will have a chance to spot it low in the northern sky during late spring or early summer. True to its name, the Hidden Galaxy can be difficult to find, especially if your sky is light polluted or even slightly cloudy or hazy. Wait for the clearest of nights and travel away from city lights to search for it with a telescope.
This image of the center of Caldwell 5 is a combination of visible and ultraviolet observations captured by Hubble’s Wide Field Camera 3. Astronomers used Hubble’s observations to learn more about the stars clustered at the center of the galaxy.