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

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

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, ...

Using two infrared space telescopes and a 23-year gap, scientists may have spotted a mysterious, slow-moving object beyond ...

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

For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

but it means it's not Planet Nine," Brown told Science. "I don't think this planet would have any of the effects on the solar system that we think we're seeing." But, if the researchers are right ...

The solar system is our cosmic neighborhood ... Neptune and then the possible Planet Nine. It's a dynamic system shaped by gravity and time, and while we've learned a lot, it still holds plenty ...

A new look through decades-old data has unveiled some of the most compelling evidence yet of a hidden ninth planet in the far ...

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