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Ahead of Valentine's Day, prepare to be dazzled by the lunar heart, created by the interplay of light and shadow on our Moon.

Earth’s days were once only 18 hours long, but the Moon’s gravitational pull is slowing our planet’s spin, stretching days over billions of years. Cyanobacteria, the oxygen-producing ...

The rocket will be used to send an uncrewed Orion craft to the Moon, in a flight expected to launch in 2021. This will pave the way for crewed missions, with a landing in 2024. The last piece of ...