The concept of terraforming Mars — transforming the planet's climate to support life as we know it — has long belonged to the realm of science fiction. But a new study argues that it's time to take ...

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 years to complete one orbit around the sun. The object, known as 2017 OF201, ...

"The planet seems to be triggering particularly energetic flares." Some planets take the expression "you're your own worst enemy" to the extreme. At least, that's what astronomers found when they ...