... Near the top are supernovae - the death explosions of massive stars, and gamma-ray bursts - the most powerful explosions seen across the Universe. A Cloud Shadow Sunrise . ... Such a ray was caught in spectacular fashion above the Florida Everglades two years ago. ... Jets from Radio Galaxy 3C296 . ... Gliding through the sky on Wednesday evening, February 20th, a first quarter Moon seemed to run over bright planet Saturn as viewed from much of North America. ... Comet Ikeya Zhang . ... February . ...