Thousands of people have reported UFOs or alien encounters in Northern California. That number could soon go up.

Wally Funk, the oldest woman to go into space, died at 87 years old. NBC News' Tom Costello looks back at Funk's Blue Origin ...

"The worst-case scenario consists of four astronauts on the moon at one time, only one month resupply window between Earth and moon, and moderate to high adverse environmental probabilities." ...

Scientists are calling for a lunar quarantine facility where samples from Mars, the Moon, and beyond would be examined before being brought to Earth. They warn that even a tiny alien microorganism ...