Antarctica has a strange gravity hole and scientists finally know why

Gravity may seem constant, but it actually varies across the planet-and one of the strangest places is Antarctica, where gravity is slightly weaker than expected. Scientists have traced this gravity hole to slow, deep movements of rock inside Earth that unfolded over tens of millions of years. Using earthquake data to essentially create a CT scan of the planets interior, researchers reconstructed how the anomaly evolved and discovered that it strengthened between about 50 and 30 million years ag...