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How Is The Total Mass Of The Universe Calculated?

We obviously can’t put the universe on a giant set of scales, but scientists have found astonishingly clever ways to […] ...

NASA’s GRACE Satellites Reveal Hidden Deep-Earth Process Behind Gravity Disturbance

Twin satellites are part of this GRACE mission. This orbited Earth in tandem to identify subtle gravity changes. As a result of shifting ocean masses or melting ice sheets, these changes generally ...