50, 100 & 150 Years Ago: May 2021

A SpaceX Dragon will make the 1st nighttime splashdown with NASA astronauts in 53 years. Watch it live.

Scientists Spot Yet Another Unexplained Ring-Shaped Radio Structure In Space. A new Odd Radio Circle (ORC) appears to span a million light years, and contains a clue that could explain these ghostly structures.

Cave Deposits Reveal Permafrost Thawed 400,000 Years Ago, When Temperatures Were Not Much Higher Than Today