Are We Alone? | How the Universe Works
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5 سال پیش
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There are billions of stars
There are billions of stars in our galaxy, with billions of planets circling them. But, as far as we know, only one planet has life: Earth. But are we really alone?
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5 سال پیش
در تاریخ 1399/01/08 منتشر شده
است.
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