If Planet 9 is real, this observatory has around a 70 to 80 percent chance of finding it, he estimates, adding that it's not a sure thing because there are so many uncertainties.

Observers could see up to seven planets line up in the sky after sunset on Friday, but you may need a telescope to see them all.

There's still time to see the 'planet parade' that began in January: Here's what's visible Because they don't happen every year, such cosmic displays tend to attract significant public interest ...

Pluto was demoted from a planet to a dwarf planet in 2006. So why is its status still so controversial today? When you purchase through links on our site, we may earn an affiliate commission.

An object seen to have moved in the time between when it was imaged by the IRAS and AKARI surveys in 1983 and 2006 respectively could be Planet Nine.