# Space question

Is there any probability that our sun is in binary system with another star within our galaxy ?

Note by Vivek Bhal
4 years, 11 months ago

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If there were another star that formed a binary system with our star, then that star would either a) have to be far enough away that we wouldn't notice its gravitational pull on the planets in our solar system, or b) only pass through this part of its orbit very infrequently. If a is true, then why even bother calling it a binary system, since neither star affects the other? If b is true, then there would be massive disruptions to the solar system every time the second star passed through, and some planets (if not all of them) would be thrown out of their orbits, probably to be swallowed by one of the stars. The Kuiper Belt and Oort Cloud would both have massive holes where the second star passed through, which we would be able to observe.

Basically, while I suppose it's still possible (in that anything is possible until proven impossible), it's very, very, very unlikely that our sun is in a binary system with another star in the galaxy and we don't know about it.

- 4 years, 11 months ago

That can't be the case,as the planets will become unstable and quickly get ejected

- 4 years, 11 months ago

Well probably in most cases, but not in all.

- 4 years, 11 months ago

yes there is about 200-400 billion stars in our galaxy

- 4 years, 10 months ago

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