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Secret spacecraft lands after 434 days in orbit
The US Space Force’s classified spacecraft, the X-37B, has safely returned to Earth after an awe-inspiring 434 days in orbit. This record-breaking mission has led to a whirl of speculation and ...
Mars didn’t always look like the barren world we see today. Over billions of years, the Sun’s solar wind stripped away much of its atmosphere, helping transform it from a warmer, wetter planet into a ...
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