Question: On what planet was a large rectangular outcrop that is composed mainly of sandstone first observed by an English astronomer born 1618?
Sentence (from "Horrocks Block"): It was mapped by the Directorate of Overseas Surveys from satellite imagery supplied by the U.S. National Aeronautics and Space Administration in cooperation with the U.S. Geological Survey, and was named by the UK Antarctic Place-Names Committee from association with Venus Glacier after Jeremiah Horrocks, the British astronomer who predicted and first observed a transit of Venus, in 1639.
Relevant evidence: No