Posted on October 13, 2018 by admin Question #9 In the same quote (below), what is an "observation"? "…Opportunity explored the 'Marathon Valley' area of Endeavour's western rim, documenting the geological context of water–related minerals that had been mapped there from orbital observations." Post navigationPrevious post: nature.com: Rethinking Mars explorationNext post: 1984 – Connecting Literature to Today