In 2004, scientists found Sedna, a potential dwarf planet beyond the belt, had a strange orbit around the sun that hinted another large mass was gravitationally pulling it. A 2014 study found a ...

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

2015 TG387’s orbit is observed to be similar to other dwarf planets such as Sedna and 2012 VP113, which also are extremely elliptical. 2012 VP113 was discovered by Dr. Sheppard’s team and has ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

who orbit on average 150 times farther from the Sun than Earth. Among the half-dozen is the first known ETNO, the dwarf planet Sedna. The six curiosities that Brown and Batygin identified have ...

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

Opinions expressed by Forbes Contributors are their own. Jamie Carter is an award-winning reporter who covers the night sky. Computer simulations suggest that there is an undiscovered Earth-like ...

As a result, it would take this new planet between 10,000 and 20,000 years to make just one full orbit around the Sun ... for helping demote Pluto to a dwarf planet. Related: Exoplanet hunters ...

“A dwarf planet is an object in orbit around the sun that is large enough to pull itself into a nearly round shape but has not been able to clear its orbit of debris,” the IAU said in an ...