New Moon - The Moon is between Earth and the sun, so the side we see is dark (in other words, it's invisible to the eye).
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He added the ultrasonic speakers are lowered into the seabed "a bit like a lobster pot".
She says she has no regrets about bringing her astronaut career to an end. She made her decision and didn't look back. But there's still a wistful look in her eye when we ask if she'd be tempted if a seat on a spacecraft became free.