doesn't work like that. It's an estimate based on the amount of sand in say, 1 ml, or something along those lines. then they multiply it by the volume of the beaches on the earth.
It's not exactly 100 stars per grain of sand, but it's a rough estimate.
Never said Jupiter didn't have gravity. I said ti was made of gas, therefore cannot have craters. Make sense?
In the multiple astronomy classes that i have taken, not one professor has said anything about Earth hvaing a twin, and the collision of those two creating the moon. I have heard large asteroid/comet, but never a twin planet scenario. Got a source to that? I'm curious to read it.
"We've recently found out that the night sky, with all its hundreds of thousands of visable stars, makes up just one tenth of just one "tentecle" if you will of the galaxy."
Judging by that, and the fact there is 9 other areas of space equal to the distance we can see in our night sky, and another seven "tentcle" things off the galaxy, so 80 sections in this galaxy alone. Then another several hundred other known galaxies that have been recorded and marked down. And 93% of them are bigger then our own.
If you take all that together, with all those billions... No, trillions of planets. Alien life is pretty much garunteed. And then there are the infinite number of other galaxies. I've no doubt aliens exist. Probally a lot closer to us then we think.