This is probably the most convincing evidence for Planet Nine so far. It is believed that this planet is five to ten times ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in ...

The National Science Foundation’s Daniel K. Inouye telescope debuted a close-up of the sun captured by its new, ...

By sifting through that vast dataset, the team found 2,889 likely superflares on 2,527 sunlike stars. That works out to ...

In our daily lives, the sun seems constant and quiet, sedately shining at a steady pace. A fundamental rule in physics is ...

Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about ...

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...

Astronomers may have found a candidate for Planet Nine. This planet is beyond Neptune. The finding could be the first ...

The solar system consists of our star, the sun, and everything bound to it by gravity: the planets Mercury, Venus, Earth, ...

Jupiter and Mars shine in the evening, more planets gather in the morning, and the Eta Aquariid meteors join in.