A newly discovered dwarf planet called 'Ammonite' (2023 KQ14) has been spotted in the outer solar system, and it could be ...

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

Almost a decade after astronomers proposed the existence of Planet 9, an unseen extra planet in the distant reaches of the solar system, they still haven’t all agreed whether it’s real or not ...

Below, the first panel shows a simulation with Planet Nine included. What’s more, these simulations actually align with what was observed over long-period orbits that cross Neptune’s path ...

"This hypothetical Neptune-sized planet would circle our Sun on a highly elongated path, far beyond Pluto. It could have a mass about 5 to 10 times that of Earth and orbit about 20 to 30 times ...

And long range is, honestly, underselling it—top theories for the positioning of Planet 9 place it around 400 astronomical units (AU). The furthest known planet, Neptune, is only about 31 AU.

The 2015 research suggested that this Planet Nine could take between 10,000 and 20,000 Earth years to orbit the sun only once, following a long, elliptical-shaped path.

Planet 9 would have an odd tilt to its orbit, to, of 20 degrees. But we won’t know for sure if there’s a hidden planet, whether it looks like Planet 9 or the KBP, until astronomers actually ...

Planet 9 would be too distant to be seen by reflected light, so you’d have to look for it by its faint infrared glow. And with a mass of only five Earths, it wouldn’t give off much heat.

As a result, a Planet Nine probe would have to travel around three times faster than Voyager 1 to reach Planet Nine in the researcher's timeframe. This may seem unlikely but it is possible, Lingam ...