There are about 200 billion stars in our galaxy, with 40 billion of them like our sun, Marcy said. One of his co-authors put the number of sun-like stars closer to 50 billion, meaning there would be at least 11 billion planets like ours
Fuel cars and airplanes, power electricity plants, and heat our homes.
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Existence itself is not homogeneous. It is heterogeneous. That means there are various kinds and degrees of purity.
