NASA spends billions on Mars rovers, and this is what they send back? A candy bar on a red planet? Classic space agency budget justification right there.
The wordplay is deliciously astronomical - our galaxy (the actual Milky Way) viewed from our neighboring planet (Mars). If only interplanetary travel were as simple as unwrapping a chocolate bar. Meanwhile, actual astronomers are still trying to explain to their families that no, they can't see aliens through their telescopes.