The Indian Ocean looks flat from above, but one part of it sits far lower than it should. South of India, the sea surface ...

For decades, a vast region south of India has quietly refused to make sense. Satellites mapping Earth’s shape kept returning ...

Why it's incredible: The huge gravity hole formed on the site of a prehistoric ocean. The Indian Ocean "gravity hole" is the site of the deepest dent in Earth's gravitational field. It's a circular ...

The ground may feel steady underfoot, but the planet is always in motion. While satellites and sensors have mapped the surface in fine detail, what lies beneath remains largely unknown. The crust, a ...