Earth Has a New ‘Quasi-Moon,’ and It May Be Very Tiny

Earth has a number of mini-moons and quasi-moons. Mini-moons are objects that orbit our planet. But they make for fickle fans: They tend to swing around Earth for only a matter of months. One example ...

Day and night get equal billing Monday as fall equinox arrives. Here's what to know

The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the ...

A discovery on Mars has clues about 'humanity's oldest questions'

The news: NASA's Perseverance rover had found potential signs of ancient microbial life on Mars. The discovery represents "the closest we have ever come to discovering life on Mars," NASA acting ...
The Lancet

Orbital atherectomy for stent implantation: the ECLIPSE trial

The ECLIPSE trial by Ajay J Kirtane and colleagues1 represents the largest randomised investigation to date comparing orbital atherectomy with conventional balloon angioplasty in patients with ...