Dear Indian Ocean, please don’t take offense, but: Why is your gravity hole so big? That question had been baffling scientists ever since the hole was discovered back in 1948. Now a team from the Indian Institute of Science (IISc) thinks they have found the answer: The “hole” in the Indian Ocean is caused by fragments from the sunken floor of another, much older ocean. In a mysterious part of the Indian Ocean, the pull of gravity is much weaker than anywhere else on Earth. This gravity hole, the world’s…