WILL THE EARTH BE SWALLOWED UP BY SUN ONE DAY ?

In about 5 billion years when hydrogen  in the sun's core has been exhausted,the sun will swell up and become a red giant.Astronomers are not entirely sure just how large will the sun eventually become,but it is likely that in the phase of development the sun will only consume the inner planets Mercury and Venus.However if Earth is spared total annihilation-life on earth will no longer be possible.A gigantic and hostile Sun will shine 2300 times its current intensity and will cause the earth's crust to melt into an  ocean of lava.Don't worry none of us will be alive for 5 billion years......