Besides our sun how many miles is the closest star to our solar system?

Proxima Centauri

4 light lears

299,792.458 km per second times

60 seconds times

60 minutes times

24 hours times

365 .25days times

4 years

=37,842,921,890,323 kilometers

times 0.62137 Miles

=23,514,456,374,990 miles to next star system

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23.5 trillion miles...That's far.

It's Proxima Centari (Alpha Centari B). About 24.6 trillion miles away.

Actually Alpha Centauri is a triple star system and the closest of those stars is called Proxima Centauri at 4.3 light years from earth. One light year is how fast light can travel in one year at the speed of 186, 000 miles per second. Whew!

Well, dealing with distant objects, they don't use a "mile" system, they use something called a light year, which is what it sounds like, they formulate how far it is by how far light would travel in one year at 386,000 miles per second.

so if it was 20 light years away it would be 243457920000000 miles away.... and the best I remember alpha centari is 56 light years away....

Probably none. Especially if you mean complex lifeforms. Complex lifeforms take billions of years to evolve (based on a statistical example of one - ie Earth!). Stars that are any more massive than the sun will have a lifetime that is too short for such life to evolve. Space contains a lot of red dwarfs. The habitable zone around these is very narrow, making it unlikely that a biologically friendly planet like Earth will form there. But there's a better arguement. There are far more red dwarfs than yellow main sequence stars, yet we find ourselves inhabiting a planet with a yellow star. This is unlikely unless there is some parameter that favours yellow stars for a habitable planet.

Alpha Centauri is estimated to be 4.2 to 4.4 light-years away, so about 24 trillion miles.

The next nearest star is four light years away.

At 186,000 miles a second, 3600 seconds per hour, 24 hours per day, 365.26 days per year, the number of miles is

23479497216000 miles.

Alpha Centaura is 2 light years away. I don't know how far a light year is.

Roughly 4.2 lightyears. Light travels at 186000 miles per second. You do the math.

Proxima Centauri at 4.2 light-years is the correct answer.

the closest star to the sun is a "red dwarf" star called proxima centauri. it is about 4.22 lightyears away.

http://en.wikipedia.org/wiki/Proxima_Centauri