The cosmos has delivered a visitor, a silent, icy interloper from the darkest reaches of our galaxy, and the world's most powerful eyes are glued to its progress. This is not a scene from a science ...

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars. When you purchase through links on our site, we may earn an affiliate commission.

Our solar system resides inside a vast cavity, now known as the Local Bubble, which is about 1,000 light-years across. When you purchase through links on our site, we may earn an affiliate commission.