Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: johnnikolus on 14/12/2009 06:09:21

Title: What surrounds stars?
Post by: johnnikolus on 14/12/2009 06:09:21

I have one doubt [???]

The Sun is a star right?

Then there must be countless stars in the Universe and there may be infinite planets orbiting around that stars? So, at least one planet may contain animals..... [::)]

Title: Re: What surrounds stars?
Post by: RD on 14/12/2009 07:09:45

You may be looking for this ...

Quote

The Drake equation (also sometimes called the "Green Bank equation," the "Green Bank Formula" or – erroneously – the "Sagan equation") is an equation to calculate the potential number of extraterrestrial civilizations in our Milky Way galaxy. It is used in the fields of exobiology (http://en.wikipedia.org/wiki/Exobiology) and the search for extraterrestrial intelligence (SETI).

This equation was devised by Dr. Frank Drake (now Professor Emeritus of Astronomy and Astrophysics at the University of California, Santa Cruz) in 1960, in an attempt to estimate the number of extraterrestrial civilizations in the Milky Way (our galaxy) with which we might come into contact.

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

Title: What surrounds stars?
Post by: chris on 30/12/2009 10:25:05

The currently accepted "lowest case scenario" for the number of stars in the Universe is 70 sextillion (7 x10^22).

So that narrows the numbers from "countless" a bit...

Chris

Title: What surrounds stars?
Post by: questioner on 30/12/2009 23:58:28

If there is a possibility of other life in the universe then perhaps some ufo's are real. If so they would have covered vast distances to visit us approaching light speed or exceeding it or they have an incredibly long life span. What if we are wrong and once you can control gravity you can travel at light speed.

Title: What surrounds stars?
Post by: Geezer on 31/12/2009 07:01:43

Quote from: questioner on 30/12/2009 23:58:28

If there is a possibility of other life in the universe then perhaps some ufo's are real. If so they would have covered vast distances to visit us approaching light speed or exceeding it or they have an incredibly long life span. What if we are wrong and once you can control gravity you can travel at light speed.

Em, what are we wrong about? (I'm sure we are wrong about many things.)