President Donald Trump’s fiscal 2026 budget request, if approved by Congress, would kill many of NASA’s plans for robotic ...

American planetary scientists have ruled out the existence of the hypothetical ninth planet, commonly referred to as "Planet X", in 75 percent of the sky regions where it was previously believed to ...

Scientists say it’s important to research geoengineering – large-scale attempts to cool the planet to fight climate change – ...

It’s been 18 years since Pluto’s celestial status was called into question—yet the matter seems far from settled. We asked experts from both sides to make their case. This 2015 NASA image of ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

The discovery of the exoplanet, a super-Earth called Kepler-735c, is all down to something called transit timing variations, ...

Astronomers have spotted a cosmic mismatch that has left them perplexed - a really big planet orbiting a really small star.

Giant planets are not rare per se — after all, we have four in our own solar system. Such large worlds are, however, rarely ...

Scientists have discovered a giant planet called TOI-6894b, orbiting a star that should be far too small to have formed it. The discovery could further challenge theories of planet formation.

It had not been thought possible that such tiny, weak stars could provide the conditions needed to form and host huge planets.

Dozens of NASA's missions to explore the cosmos could be in jeopardy under a budget proposal from the Trump administration.