NASA's MAVEN spacecraft, which arrived at Mars last month, has sent back its first images of the Red Planet's atmosphere as it was battered by a large solar storm. These images are the first of their kind, providing us with information about Mars' ozone layer, and the tenuous oxygen, carbon, and hydrogen coronas at the edge of Mars' atmosphere. These coronas can tell us what the conditions on Mars might've been like over the last four billion years, detailing how the planet went from being warm and wet (and perfectly suited to harboring life), to the cold, dry, dusty sphere that it is today.