Hubble Space Telescope Photo Gallery

Hubble Space Telescope Photo Gallery

This image made by the NASA/ESA Hubble Space Telescope shows the star cluster Pismis 24 in the core of the large emission nebula NGC 6357. Part of the nebula is ionised by the youngest (bluest) heavy stars emitting intense ultraviolet radiation, heating the gas surrounding the cluster and creating a bubble in NGC 6357. The Hubble Space Telescope marks its 25th anniversary. A full decade in the making, Hubble rocketed into orbit on April 24, 1990, aboard space shuttle Discovery. (NASA/ ESA, Jesus Maiz Apellaniz - Instituto de Astrofisica de Andalucía, Spain via AP)