Astronomers have found thousands of exoplanets — worlds beyond our solar system. Most of them are in single-star systems, like our own solar system. A few dozen orbit binary stars, dancing delicately ...

Our solar system was formed about four and a half billion years ago, from a massive cloud of gas and dust which collapsed on ...

We’ve learned that Mars is the only planet in our solar system that could be habitable, thanks to its temperature and the ...