ScienceTake that! Russia threatens to shut down ISS in 2020 in retaliation for U.S. sanctions Russian says it will not offer a way for U.S. astronauts to travel to the International Space Station past 2020. Announcement seen as response to U.S. sanctions over Ukraine crisis.by Jim Algar
ScienceNASA: All bags are packed, not yet ready to land on asteroid. Astronauts in training.by Cez Verzosa
ScienceNASA telescopes record intense X-class solar flare: Best-observed flare of all time [VIDEO]by James Maynard
ScienceChandra Observatory zooms into star clusters. What it finds out challenges conventional belief.by Alexander Saltarin