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The Sun is not expected to change much in the next million years. In a few hundred million years, on the other hand, it will get so hot that life on Earth will be impossible.
As old as history itself, at least a few million years.
It is now known what North America look like 100 million years from now.
60 million years ago Canada was a mass of ice.
Well, i like chicken. what is that thing when your crush calls, OH YEAH imagination. *ITS A VINE*
Mountain ranges we see today are only a fragment of what they were like before erosion over million of years reduced them to their present form.
Not for at least several million years, if it were to happen at all. A change like that is so extreme that our bodies as we know them couldn't handle that, so it would have to evolve over the years.
nuthinq . a star ?
Three millennia (the plural of millennium) is 3000 years. Each millennium is 1000 years. (A millennium is not one million years, despite sounding like "million".)
Who knows ? THey will all look different though... as our galaxy spins, the stars all change their places. Of course this takes tens of thousands of years to even make a tiny change, so it won't matter to us.
Geologic time is very long, so a million or more years is the best choice.
Ice age!