Solar System

"I am the watcher on the walls."

There are billions of dollars in it for companies able to kickstart mining operations, even if such returns are still years away.

Why do people often adopt and develop beliefs that lack strong supporting evidence?

The image offers a rare look at how Earth's surface and atmosphere interact after sunset.

The microwave-sized sensor detects 'spectral fingerprints' of important minerals.

The South Sandwich Islands were born from a tectonic collision, forged by volcanism and relentlessly reshaped by ice, wind and waves.

Outside Earth's protection, space travellers will be routinely exposed.

3I/ATLAS may have moved away from Earth as it makes its way out of the solar system, but this interstellar intruder continues to delight and surprise astronomers.

Highlights from a cometary trio that captured our imaginations.