The first person to say that hydrogen and helium are the most abundant of the stars in the universe was the one who got the astronomy phd for this subject. The stars can be classified according to their brightness. She...
Kepler was a deep space telescope orbiting the Sun at a distance of 3 million kilometers from Earth. We were not sure if there were any planets outside the Solar System. Since then, and running out of fuel in 2018,...
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