Let’s try a demonstration that we all enjoyed in elementary school. Close one eye, hold out your thumb at arm’s length, and align it with an object on the other side of the room. Without moving your ...
Let’s try a demonstration that we all enjoyed in elementary school. Close one eye, hold out your thumb at arm’s length, and align it with an object on the other side of the room. Without moving your ...
A reader from Jackson, Mo., asks, "How do astronomers know the distances to the various objects they talk about?" The answer is that astronomers use a "boot strap" process to determine distances over ...
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