Nation Scientists just discovered that an asteroid may have ended ‘Snowball Earth’ 2.2 billion years ago January 21, 2020Doyle Rice, USA TODAYComments Off on Scientists just discovered that an asteroid may have ended ‘Snowball Earth’ 2.2 billion years ago Some 2.2 billion years ago, an asteroid slammed into the Earth, leaving behind a massive, 43-mile-wide crater in what's now Western Australia.