life's little mysteries
Our solar system has been orbiting the Milky Way's black hole heart for 4.6 billion years. But it is hard to pin down exactly how many trips around the galaxy our sun has made during that time.
Intense pressure and sweltering temperature would accompany a trip down through Earth's layers and out through the other side. However, this trip would be possible only in science fiction.
Why does ice float in water, instead of sinking to the bottom? It has to do with water's density and molecular structure.
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