Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes and 4 seconds with respect to other distant stars. Scientists call this difference crucial to ...
In distant galaxies exist stars that are smaller and cooler than our own Sun. These so-called red dwarf or M dwarf stars also live 10 times as long as stars like ours and are the most numerous in our ...
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