Question:  Shackleton is an impact crater is named after Antarctic explorer Ernest Shackleton, a polar explorer who led three British expeditions to where?
Sentence (from "Ernest Shackleton"): Sir Ernest Henry Shackleton ( ; 15 February 1874 – 5 January 1922) was a polar explorer who led three British expeditions to the Antarctic, and one of the principal figures of the period known as the Heroic Age of Antarctic Exploration.
Relevant evidence: Yes