Lifeform of the week: Rats

The secret life of urban rats.

Climate change’s role in Louisiana floods

After a rapid assessment, scientists have concluded that climate change increased chances of the August record rains in Louisiana by at least 40%.

After a year on (simulated) Mars

A week ago, a test crew emerged after living for a year in Mars-like conditions inside a solar-powered dome on the slopes of Hawaii’s Mauna Loa volcano.

Hurricane Hermine strikes Florida coast

National Weather Service in Tallahassee reported that Hermine made landfall east of St. Marks, near Tallahassee, early Friday morning as a Category 1 hurricane.

Space X explosion at Cape Canaveral

No injuries in Thursday's explosion on a SpaceX launch pad at Cape Canaveral. But Facebook's planned satellite is no more.

No alien signal, says SETI astronomer

A strong signal from a sunlike star sparked speculation this week that we might - at last - have heard from an alien civilization. Now astronomers say ... no.

Watch spacewalk live September 1

NASA TV will broadcast live coverage on Thursday of a 6.5-hour spacewalk by 2 astronauts aboard ISS. Coverage will start at 6:30 a.m. EDT (1030 UTC). The spacewalk will begin about 8 a.m. EDT (1200 UTC).

Your cosmic suntan

Lie on the beach, and your body is bombarded by light from our sun, and from beyond our galaxy.

Watch SpaceX Dragon depart ISS Friday

Live coverage Friday of cargo ship's departure from International Space Station. Begins at 5:45 a.m. EDT (9:45 UTC).

Strong earthquakes rock Italy overnight

Dozens reported killed, and over 150 missing, in the earthquakes that shook Italy in the early morning of August 24. Searches ongoing.