Nova in Sagittarius
As seen on Astronomy Picture of the Day, in this Milky Way image from Indian Himalayas there is a new star, a nova, in the middle of the Sagittarius Teapot. Move the slider on the mage to spot it. The erupted nova (named Sagittarii 2015 No. 2) reached magnitude 4 in March 2015, visible to naked eye. A nova is a cataclysmic nuclear explosion on a white dwarf (in a binary system), which causes a sudden massive brightening of the star. It is different from supernova, a smaller phenomenon that does not happen at the core of an old massive star and it does not destroy the star. Some nova outbursts repeat many times through the ages.