"What surprised us, at the end, was how effective this type of impact could be in explaining Mercury's unusual structure ...

Mercury has long puzzled scientists as it possesses many qualities that aren't common to other solar system planets. These ...

It is a world of extremes. Explore facts about our solar system's fastest planet. Mercury is slightly larger than our Moon - 15,329 kilometres around its equator. Its radius, the distance from the ...

Turns out, it's as tough to drop inward into the inner solar system, as it is to head outward. The problem stems from losing ...

Meet the author: Dr. Phil Plait is an astronomer, author, and science communicator with a PhD in astronomy at the University ...