When the sun expands in its late age to a red giant, where will its outer edges touch?

Question

When the sun expands in its late age to a red giant, where will its outer edges touch?

Answer 1

Earth's fate is unclear. As a red giant, the Sun will have a maximum radius beyond the Earth's current orbit, 1 AU (1.5×1011 m), 250 times the present radius of the Sun. However, by the time it is an asymptotic giant branch star, the Sun will have lost roughly 30% of its present mass due to a stellar wind, so the orbits of the planets will move outward. If it were only for this, Earth would probably be spared, but new research suggests that Earth will be swallowed by the Sun owing to tidal interactions. Even if Earth escapes incineration in the Sun, its water will be boiled away and most of its atmosphere would escape into space. In fact, even during its life in the main sequence, the Sun is gradually becoming more luminous, and its surface temperature is slowly rising. The increase in solar temperatures is such that in about a billion years, the surface of the Earth will become too hot for liquid water to exist, ending all life

Answer 2

Probably beyond the orbit of Earth, but not out to Mars.  It's predicted that the solar atmosphere will slowly expand to engulf the first 3 planets, and the friction will cause them to spiral inward, eventually being destroyed & merging with the sun's core.  

Answer 3

our sun will died out like a light turned off the supernovel hapended that why we here cuase when the supernolve happend the higher elements spread throw space and landed to other planet

when the universe dies it would be in ice not fire

every star in the unviverse billions of years from now will die as ice

we freeze to death but billions years from now we might make machine and make a baby universe so dont worry about it  

Answer 4

It will consume Mercury, Venus and possibly the Earth too!

Answer 5

Somewhere between the orbits of Venus and Earth.

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Answer 6

http://hyperphysics.phy-astr.gsu.edu/Hba...

Answer 7

If you mean earth, yes it will be wayyyy too close for us to survive, i beleive it would actually swallow our planet up, but im not entirely sure about that last bit.

Answer 8

Right about where you're standing right now.

Answer 9

There are some that believe that the sun will be scraping Mars.

Answer 10

Best estimates are just inside Mars.

Answer 11

The sun becomes a red giant twice in old age...

The first time the "surface" will reach beyond Venus and the sun will be ~100 times its current radius.

The second time (the AGB phase) it will be 500 times larger than its current size and will swallow all the inner planets. The surface will be somewhere near Mars.

It will also start to lose mass as a result of the low surface gravity and pulsations and so solar material will stream out into the remaining solar system and start to form stardust!

Answer 12

  It is likely it will engulf the inner planets out as far as Mars.