Astronomers search for sources of mind-bending gravitational hum permeating the universe A massive hum of energy pervades the universe. Is it supermassive black holes or something weirder?

The change in gravitational energy of the mass should be equal to the change in thermal energy of the water. OK, we actually already know this relationship. But it's still fun to reproduce it.

Australian renewables startup Green Gravity has teamed with underground mining contractor RUC to accelerate the commercialization of its gravitational energy storage tech.