The Greenland Ice Sheet is close to a melting point of no return

The Greenland Ice Sheet is close to a melting point of no return

[NASA on Twitter] Newly-discovered asteroid 2023 DZ2 will pass Earth more than 100,000 miles (161,000 km) away–about half the distance to the Moon–making its close approach at 3:51 p.m. EDT (12:51 p.m. PDT)

Readers ask about bird droppings, Ice Age cave art and more