Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more . CNN  —  An international research team has successfully drilled and retrieved a 9,186-foot-long (2,800-meter-long) ice core from Antarctica that dates back 1.2 million years. The sample extended so deep that it reached the bedrock beneath the Antarctic Ice Sheet. The core, nearly as long as 25 soccer fields end to end or six and a half times taller