A team of astronomers from Taiwan has uncovered promising evidence suggesting the existence of Planet 9, a hypothesized ...

Planet Nine should appear stationary over the course of a single day but show detectable movement over months.

We still don't know for sure if there's a ninth planet in our solar system, but a new discovery could help to prove that ...

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"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

Planet Nine, also referred to as "Planet X", is a hypothesised world that some astronomers think is circling the sun beyond Pluto on a 10,000-year orbit.

Planet Nine could have been pushed out of the solar system long ago, given a slingshot by some of the other giants such as Saturn or Jupiter. “Our own solar system is remarkably neat.

Planet Nine takes between 10,000 years and 20,000 years to make a complete orbit of the sun and, unlike its nearest neighbour Pluto, which has 5,000-times less mass is, without doubt, a planet.

Since 2016, the suggestion that there might be a ‘Planet Nine’ within our solar system has rapidly transformed from left-of-field thinking to a scientific possibility.

Instead, they proposed that Planet Nine had left its ghostly imprint in the outer reaches of our solar system, distorting the orbits of the objects around it with its gravitational pull.