"aquablue" wrote in message ...
pity--so few... that sucks for chances of life


"eyelessgame" wrote in message
om...
"aquablue" wrote in message
...
How many sun like stars are in this galaxy -- on average?

Thx
alan

I assume you mean "at a guess".

The galaxy has roughly a hundred billion stars. (All these numbers
could be off by a factor of 2 or so. Take with a grain of salt.)

You'd have to define what's meant by "sun-like star". The number of
F, G, K main sequence non-multiple-system stars that are between .75
and 1.25 solar masses is probably something like two percent of the
stars in the galaxy. So roughly a billion, give or take. It's much
more likely to be 10^9 than 10^10 or 10^8, anyway.

A multiple-star system does not preclude the existence of
Earth-like planets, it just makes the existence of Earth-like
planets a little less probable (and we're not even sure about
that much!). Some believe our own sun is part of a
multiple-star system with Alpha Centauri.

Rick