For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, Pluto was officially reclassified as a dwarf planet by the ...

What if there’s a planet hiding in our solar system, 10 times larger than Earth? While this theory has yet to be confirmed, ...

Researchers Konstantin Batygin and Mike Brown say that a planet ten times the mass of Earth may be circling the Sun in a highly elliptical orbit 20 times the distance of Neptune or 36 billion mi ...

February 8, 2006 Since 1930 when American Clyde Tombaugh discovered Pluto, schoolchildren have been taught that Planet Earth is one of nine planets which orbit the sun, and that Pluto is the ...

Planet Nine, according to Batygin, is a “super-Earth” object, about five to seven times the mass of our planet, and its orbital period is between 10,000 and 20,000 years.

Solar System's Planet Nine could be closer to the sun that was recently estimated. Here's what the new Treasure Map simulation shows. ... the first Earth-size planet in the habitable zone.

Only eight planets call our solar system home. Or there might still be nine if some astronomers are correct about an as-yet undiscovered large body out past Neptune.

When most of us left school there were still 9 planets – but we’ve come a long way since Pluto’s demotion. Here’s what’s next on the space agenda. The Solar System used to have nine planets.

For three-quarters of a century, schoolkids learned that our solar system has nine planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. But things changed five years ...

Previous work has suggested that a number of far-out objects in the solar system cluster in the sky as if they are being shepherded by an unseen giant planet, at least 10 times the mass of Earth.

Don't worry though—it's not like one planet simply fell out of the solar system. ... Related: ‘There Is No Planet B’—75 Earth Day Instagram Captions To Inspire Change.

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar ...