Travel through time to witness some of the most remarkable episodes in our solar system's history, uncovering its ancient ...

This would be comparable to what happens with our own Moon ... forward for their motion, such as the effect of a ring of debris or the more fantastical idea of a small black hole. The biggest issue, ...

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

These strange objects could explain how water arrived on Earth, but may also be a previously unrecognised threat to our ...

Our sun is about five times less magnetically active than other sunlike stars—effectively a special case. The reason for this ...

An accidental discovery might change how we think about one of the most mysterious structures in our solar system. The Oort Cloud, a large expanse of icy bodies revolving around the sun at a ...

Chiron, an asteroid-comet beyond Jupiter and Saturn, is currently in retrograde, appearing to move backwards in the sky until January 2026.

– Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago.

Scientists have thought that our solar system's inner rocky planets — Mercury, Venus, Earth and Mars —formed first (around 4.566 billion years ago), while gas giants and icy bodies in the ...