Photographs of planets can fool you. A close crop of swirling cloud bands or a patch of rusty dust can look like almost anything, and many of us only recognize a planet when we see the whole disk ...

Archived observations appear to show a moving object in the far-distant outer solar system, but its reality is unclear ...

Astronomers have proposed Planet Y, a hypothetical world that could be orbiting unseen in the far reaches of our solar system. Find out more in this short video from EarthSky’s Will Triggs. Is Planet ...

A new technique has enabled the James Webb Space Telescope to spot a distant planet that was previously lost in glare ...

Add Yahoo as a preferred source to see more of our stories on Google. Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by ...

Astronomers have found a possible new dwarf planet beyond Pluto. And the remarkable thing is that they’d been photographing it for a decade without even knowing it was there. The icy world, named 2026 ...

Learn about the recently discovered trans-Neptunian object that may eventually join Pluto as a dwarf planet, found at the edge of our solar system. So many unexplored secrets still lie at the ...

View larger. | Graphic representation of deep space communications in our solar system. A new study proposes how to find aliens, or at least their communications. It found that human transmissions are ...

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Our definition of a planet has changed over the years — causing a bit of confusion. | Credit: wasan prunglampoo/Getty Images Over the past 250 years, the number of "planets" in our solar system has ...

A team of astrophysicists from Northwestern University has developed a new method to cut through the bright glare of ...