UNDER A CLEAR BLUE SKY ON MAY 27, 1959, THE DOORS OF A HANGAR at Toronto’s Malton Airport parted with a rumble. As a crowd of reporters watched, fascinated, four men in white lab coats rolled ...

After taking another peek at the "city-killer" asteroid that once had a small but uncomfortable chance of smashing into our planet, astronomers have figured out what it actually looks like: a flat, ...

K2-18b, an exoplanet 120 light-years away, may be the best hope to confirm that life exists beyond Earth. Here's what to know ...