Science News for Students
Science News for Students publishes news from all fields of science for students from middle school and up, with resources for parents and educators.
Hints of Gamma-ray Cycle in an Active Galaxy
Astronomers using data from NASA's Fermi Gamma-ray Space Telescope have detected hints of periodic changes in the brightness of a so-called "active" galaxy, whose emissions are powered by a supersized black hole. If confirmed, the discovery would mark the first years-long cyclic gamma-ray emission ever detected from any galaxy.
The gamma-ray burst GRB 080319B was so intense that, despite happening halfway across the Universe, it could have been seen briefly with the unaided eye. Astronomers from around the world combined data from ground- and space-based telescopes to conclude that the burst's extraordinary brightness arose from a jet that shot material almost directly towards Earth at almost the speed of light - the difference is only 1 part in 20 000.
Chandra :: Resources :: Chandra Animated Gifs & Other Shareables
Take a minute to find out why and how X-rays are absorbed into our atmosphere: http://chandra.si.edu/xray_astro/absorption.html NASA/SAO/CXC