Interestingly, our sun won't explode.
Heavier stars that are about 10 times heavier than
our sun explode in what's called a
supernova, but our sun is too light for
that. Unfortunately for people on Earth though,
our Sun will slowly consume its fuel in about 7
billion years, and then it expands and releases a
lot of gas, which will likely destroy most of the
planets around it. After this, what will be left
of the sun is a dense ball of carbon and oxygen
that will cool down like any other rock.
All of this is a long way away though, in a
bout 7 billion years. All civilization has been
around for about ten thousand years, which means
we could repeat all of human civilization
almost a million times before the sun dies.
Here's another way of thinking of it: the pyramids
are old, with the oldest one having been built
around 4600 years ago. If you imagine that _all_
the time between now and then (4600 years) is just
1 minute in this strange unit of time, then the
sun won't die for another 3 years of that time.
There are a lot of minutes in 3 years.
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