How and why scientists are searching for Planet X / Planet Nine / Planet 9.

After Pluto's demotion to dwarf planet in 2006, our solar system went from having nine planets to eight. But about a decade later, some astronomers proposed there was another planet, larger than Earth, hiding in the Kuiper Belt. And in...

Did you grow up thinking there were nine planets in the solar system? You might have been right all along! Today we discuss the possibility of distant worlds in our solar system.

Something heavy seems to be causing Uranus and Neptune to move in a different orbit than what we can currently account for with the celestial objects we know of. Is there a 9th planet? Does planet 9 exist? Is planet X...

Although no one's actually seen the planet that supposedly lurks in the outer solar system, planetary scientists at the California Institute of Technology presented evidence for Planet Nine's existence in January. As a spacecraft...

An asteroid streaked across Arizona's night sky, and we have a new theory on where the hypothetical Planet Nine came from.

For the first time, we are forced to consider the real risk of destabilizing the entire planet, says climate impact scholar Johan Rockström. In a talk backed by vivid animations of the climate crisis, he shows how nine out of the 15 big...

Two scientists have proposed that Planet Nine could actually be a black hole, and a handful of telescopes observed a distant black hole absolutely destroying a star!

Back in 2014, an international team of astronomers was taking pictures of distant galaxies, when they noticed a dot moving across their images. Could it be Planet Nine?

Evidence of the existence of a ninth planet in our solar system is unlikely to be a fluke, according to a pre-print of a California Institute of Technology study.<br/>

...because of Newtonian physics. But Albert Einstein and relativity had other ideas

I think that nine out of ten people, if you ask them to picture a planet in their minds, will picture Saturn. Why? It's those rings! They are irresistible. Rings are to planets as peanut butter is to chocolate. The perfect complement....

Planet 9 hunters are searching the edge of our solar system for this mysterious world, and a tiny dwarf planet may finally lead to its discovery. Watch More Space Crafts!...

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