With water being so important to life on Earth, scientists often look for it on exoplanets. But some of those worlds might ...

While Planet Y has been not yet been directly observed, unexpected inclinations found in the orbits of roughly 50 distant objects in the Kuiper Belt, suggest the presence of an "unseen" planet.

A conjunction is an astronomical event in which at least two planets – or, in this case, other celestial bodies – appear to our vantage from Earth to be close together in the sky. The trio of ...

On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...

This article was originally featured on The Conversation. Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of ...

"It's almost unfathomable to imagine what is happening to this planet. The planet's atmosphere simply cannot withstand the high X-ray dose it's receiving from its star." Using NASA's Chandra X-ray ...

In early 2025, the world observed a rare planetary parade event that won't be seen again until 2040. On the last day of February, seven planets appeared to align at the same time, creating a rare ...

Did you miss the start of the planetary alignment last week? Well, don't worry, you'll still have a few more days to see it before the month is up. But this will be your last chance for the year.