Question: why is ther one sun

Kirsty Ross answered on 21 Jun 2012:

Actually, there are *billions* of suns, in our Galaxy alone, however THE sun ( the one Earth orbits) is so close, that it looks quite large. Our sun is actually a “yellow dwarf” star – a very common, small star when compared to others that exist, like red giants. If there were two suns in a solar system like ours then it is unlikely that we could have evolved, as most binary star systems that have planets have gas giants such as Jupiter. Rocky planets like ours would have alternatively frozen and baked. Jupiter itself was almost big enough to ignite to form another sun, but it didn’t quite make it.