Astronomy Picture of the Day

Early in the 20th century, GK Persei briefly became one of the brightest stars in planet Earth's sky, an event known as Nova Persei 1901. The ejecta from the explosion, popularly called the Firework Nebula, continues to expand into space. GK Per: Nova of 1901  Image Credit & Copyright: Adam Block, Mt. Lemmon SkyCenter, University of Arizona Explanation: Early in the 20th century, GK Persei briefly became one of the brightest stars in planet Earth's sky, an event known as Nova ... Full Story