Latest Science headlines

US cold snap was a freak of nature, quick analysis finds

Consider this cold comfort: A quick study of the brutal American cold snap found that the Arctic blast really wasn’t global warming but a freak of nature.

SpaceX says rocket performance OK in secret satellite launch

The private company defended its performance after last weekend’s launch.

US hits record for costly weather disasters: $306 billion

With three strong hurricanes, wildfires, hail, flooding, tornadoes and drought, the nation tallied a record high bill.

Disasters pummeled North America in 2017

Parts of the United States were hit by fire, floods, and hurricanes. Two earthquakes hit Mexico. The Caribbean had a string of hurricanes.

Bruce McCandless, 80, first person to fly untethered in space

Mr. McCandless’s journey into the dark void above Earth was preserved in an iconic photograph.

Space station gets 3 new astronauts, making full house again

An American, Russian, and Japanese arrived at the orbiting lab Tuesday, two days after launching from Kazakhstan.