Four educator astronauts carried on Christa McAuliffe's mission of venturing to space as a teacher, including two who revived her lost space lessons.

What health challenges did Sunita Williams face after spending 600 days in space and retiring from NASA at 60?

Speaking on a podcast, Williams said prolonged exposure to microgravity can have lasting effects on the body, some of which ...

Astronauts appear to undergo rapid but temporary biological changes during spaceflight, with some markers linked to ageing ...