What reflects warmth away from the sun in Antarctica?

Antarctica is the coldest, driest, and windiest continent on Earth. The average temperature in Antarctica is -57°C (-70°F). The lowest temperature ever recorded on Earth was -89.2°C (-128.6°F) at the Soviet Union's Vostok Station in Antarctica on July 21, 1983.

The ice and snow in Antarctica reflect about 90% of the sunlight that hits it. This is why Antarctica is so cold. The ice and snow also trap heat, which makes it even colder.