Adults between the ages of 18 and 64 should aim for seven to nine hours of nightly sleep, according to the Sleep Foundation.

Seven planets are set to appear in the night sky this month in a rare full planetary alignment. Mars, Jupiter, Uranus, Venus, ...

ESA's Solar Orbiter captured views of the planet Mercury passing in front of the Sun. Multiple instruments aboard the spacecraft captured the imagery. Credit: Space.com | footage & orbit animation cou ...