What Caused the End-Ordovician Mass Extinction? Cooling Climate Might Be Responsible Not the Lack of Oxygen Medicine & Technology Nov 02, 2021 A new study reveals what caused the Earth's first mass extinction, which killed 85% of marine species that mostly lived in shallow oceans near continents.
Space Weather Alert: NOAA Warns of a Solar Radiation Storm With 60% Chance of Hitting the Earth This Week
SPACE Helium Leak Delays Boeing’s Astronaut Launch Attempt for the Second Time; Crew Debut Set on May 21 After Spacecraft Repair
SPACE Bizarre Planet 'WASP-193b' Found To Have the Density of Cotton Candy Despite Its Enormous Size, Making It Second-Least Dense Exoplanet Ever Discovered