'Probably Earned My Keep': 25 Years Since the Launch of the Compton Gamma Ray Observatory (Part 2)

The Gamma Ray Observatory (GRO) is readied for deployment on 7 April 1991. Photo Credit: NASA, via Joachim Becker/SpaceFacts.de

A quarter-century ago, this week, the crew of Atlantis delivered into orbit the heaviest scientific payload ever launched at that time by the space shuttle. Commander Steve Nagel, Pilot Ken Cameron, and Mission Specialists […]

'If It Goes Poorly, You Take the Blame': 25 Years Since the Launch of the Compton Gamma Ray Observatory (Part 1)

Astronaut Jerry Ross grins through Shuttle Atlantis’ aft flight deck windows, as the Compton Gamma Ray Observatory is readied for deployment in April 1991. Photo Credit: NASA, via Joachim Becker/SpaceFacts.de

For a few hours in early April 1991, it seemed that things could not get any worse for NASA. A year earlier, the […]

Dawn Spacecraft Begins Extensive Study of Dwarf Planet Ceres from Lowest Orbit

Artist’s conception of Dawn orbiting Ceres. Image Credit: NASA/JPL-Caltech

The Dawn spacecraft just recently entered its lowest and final orbit around the dwarf planet Ceres, providing the closest look ever at the puzzling world. Dawn will, of course, be taking thousands more high-resolution photographs, but what else will it be doing during the […]

In Search of the Invisible Universe: Newly Discovered Dwarf Galaxies Around the Milky Way Might Hold Clues to Dark Matter

An illustration showing the distribution of the two dozen known dwarf satellite galaxies around the Milky Way. Astronomers have recently discovered nine more additional such candidate objects below the plane of the galaxy, shown here in red. Image Credit: S. Koposov, V. Belokurov (IoA, Cambridge). Background: 2MASS

The mystery of dark matter has […]

NASA’s Fermi Mission Provides More Insight on Thunderstorm Gamma Rays

New research merging Fermi data with information from ground-based radar and lightning networks shows that terrestrial gamma-ray flashes arise from an unexpected diversity of storms and may be more common than currently thought. Image Credit: NASA’s Goddard Space Flight Center

Gamma rays make up a considerable amount of the cosmos. They can be […]