The Top Science Mysteries

September 16, 2014 6:52 PM

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The Top Science Mysteries

There are numerous websites entitled "Top 10 Unsolved Science Mysteries," or some slight variations on this theme. However, even a cursory examination of these sites reveals that the choices for the "top 10" are far from being unanimous. Here I have identified three "mysteries" that appear on many -- but definitely not all -- lists (in no particular order).

With billions of Earth-size planets orbiting their host stars in the "habitable zone" (the region that is neither too hot nor too cold, so that it allows for liquid water to exist on the planet's surface) is it possible that Earth is the only planet in the Milky Way galaxy hosting life? Fortunately,...

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