Nasa's Messenger was the first spacecraft to orbit our solar system's inner most planet Mercury. Turns out it's not just a dormant, scorched rock but a dynamic place, with an enormous internal core relative to its size.
Nasa's Messenger was the first spacecraft to orbit our solar system's inner most planet Mercury. Turns out it's not just a dormant, scorched rock but a dynamic place, with an enormous internal core relative to its size.