The first convincing evidence of liquid water on a comet comes from analysis of a sample of Comet Wild-2, returned to Earth by NASA’s Stardust space mission.
The moon is our closest neighbor in space, but today two asteroids come closer. One passed through the Earth/moon system this morning - and the other minutes ago.
A new-found fossil reveals the soft body of a 500-million-year-old undersea creature. Hemichordate Galeaplumosus abilus may provide clues to the evolution of vertebrates like us.
David Monsma of the Arctic Institute describes key findings and recommendations of a new report - The Shared Future - from the Commission on Arctic Climate Change.