The Sun is going to swallow Earth in 5 Billions years!?

As estimated by our own human being. The sun will run out of steam and burning its core after 5 billions. This will result in expanding the size of the sun and swallow Earth and Mars. That means we are just a milestone as human? As whatever we do as to family, race, business, money etc will all become a history. 5 billions years do we need to care? Or we should rethink our every day life? God is great that created all these and I believe he has his arrangement for us.

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