The universe is supposed to be about 14 billion years old. There may be multiple universes. Human beings have been around for perhaps just 50,000 years. A human lifetime is about 80 years. There are perhaps 10^25 planets in the universe - a huge, huge number! There are perhaps 7 billion people on Earth today.
It is hard to get one's head around these numbers. On the one hand we seem insignificantly small and irrelevant. On the other hand it doesn't feel that way.
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