Quote:
Originally Posted by All Darc
What is Sun's lifespan?
It already have some billion years old. It dies when runs off when fuel (hydrogen is finished).
I presume it today have less hydrogen than 160 million years ago.
Would be right to presume that with less hydrogen it activity it's not the same ?
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The sun consumes 5 billion Kg of hydrogen per second, and the rate changes over time. Long before the sun runs out of fuel, it will expand in size and consume the nearby planets including Earth.
The important question isn't how long will the sun last, but rather how long will it radiate energy hospitable to human life.