@notenoughspacetalks: Neil deGrasse Tyson explains a wild physics fact: if you could drill a straight tunnel through the Earth and fall through it, the journey to the other side would take about 90 minutes. No matter where the tunnel starts or ends. As you fall, gravity pulls you toward the center, accelerating you. After passing the center, gravity slows you down until you come to a stop exactly at the other side — like a perfect cosmic pendulum. The surprising part? Even if the tunnel goes between any two points on Earth, the travel time stays the same. It’s a beautiful result of how gravity works inside a sphere — turning the entire planet into a natural harmonic system. Physics doesn’t just describe the universe. Sometimes it reveals patterns hiding in plain sight. #NeilDeGrasseTyson #Physics #gravity #Earth #Science