NASA launches TESS spacecraft
Satellite will scan almost the entire sky for at least two years
Most influential astrophysicist returns home, to Greece
Boasting a 50-year career, Prof. Stamatios Krimigis has been appointed as the head of the newly established Hellenic Space Agency in Athens
There’s only so much time left to look for life on Mars before life arrives from Earth
The 51-year-old Outer Space Treaty, which obligates the U.S. and other signers to avoid the “harmful contamination” of other celestial bodies
