Japan declared its Akatsuki spacecraft dead on Tuesday (Oct. 28), more than a year after the Venus climate probe failed to respond to calls from mission control.

Researchers claim flashes of light seen in sky surveys could have been UFOs drawn to Earth by nuclear tests, but more mundane explanations should be explored first.

Using the James Webb Space Telescope, scientists mapped the ultra-hot Jupiter WASP-18b in three dimensions, uncovering a blistering hotspot where water molecules are torn apart.

Two new climate reports warn Earth's vital signs are flashing red after the hottest year in 125,000 years, but say recovery is still possible with swift action.