In March, I visited the Lowell Observatory — the astronomical research site where Pluto was first discovered — in Flagstaff, Arizona. I stood in line to squint through telescopes at Jupiter and the ...

Not every space traveler has worn a suit or walked upright. From monkeys to microscopic marvels, these species show how far life on Earth has reached. You’ve seen the headlines. The James Webb Space ...

Scientists were worried about the effects of prolonged weightlessness on the human body. Some experts questioned whether humans could survive extended periods without gravity. To address these ...