But the saga's not over. 2024 YR4 will be back for another pass, Athabasca University astronomer Martin Connors writes in an essay for The Conversation — and there'll be others like it.

Surmount Sunwapta Pass, where the Atlantic and Arctic watersheds divide. Ride massive ice explorer vehicles onto the otherworldly surface of the Athabasca Glacier. These dramatic 181 miles of ...