science
London tube stations reach extreme temperatures
Researchers have recorded temperatures as high as 42 Celsius in London Underground stations amid rising global heat. Jonathan Paul, a scientist at Royal Holloway, University of London, measures these conditions using a thermometer-equipped smartphone. Underground commuters face stifling heat with no easy escape.
Comet Lemmon nears Earth in October 2025
A comet discovered earlier this year will reach its closest point to Earth this fall. Named after the observatory where it was spotted, Comet Lemmon offers a rare viewing opportunity before it vanishes for over a millennium. Astronomers first detected it in January at the Mt. Lemmon Observatory in Arizona.