article_snippet: From the ground, Our could take a snapshot of the whole hemisphere on a single night," said Goddard's Michael Mumma.
article_snippet: That would amount to an ocean proportionally larger than the Atlantic on Earth.
article_snippet: an ocean had a maximum depth of around 5,000 feet or around one mile deep," said Villanueva.
article_snippet: As a result, the remaining primeval ocean water continued to move toward the poles, where the remaining primeval ocean water eventually froze.
article_snippet: CNN's Ben Brumfield contributed to this report.