The so-called 'planetesimal belts' are filled with tiny millimeter-sized particles created by collisions between comets.

Yes, six planets will be visible in the January night sky. And yes, they'll be in a line. But because planets always appear in a line from our Earth-bound vantage, the alignment isn't anything out ...

"See To Believe uncovers the forgotten, mind-blowing facts that will leave you questioning everything. Follow wild stories of ...

While Pluto was dropped from the solar system’s roster of planets in 2006, a much larger replacement might be on the way. Late last month, California Institute of Technology researchers released ...

These planets will be spread out across a long arc but two unseen planets will be there as well. Uranus and Neptune, only visible through a telescope, will be part of the planetary alignment in ...

Planet X, a hidden giant seven times Earth’s mass, challenges astronomers with its faint light and distant orbit, potentially ...