G
g_riff
Guest
There are many variables that determine how likely it is that life beyond earth exists, some of which have been outlined in the famous Drake Equation. However, I believe that this equation fails to take into account a large number of these variables. I want to update the Drake Equation - that is, consider *ALL* of the variables, determine the most accurate value possible for each one based on all relevant knowledge, and come up with a value for the expected number of complex alien "groups" throughout the universe. Keep in mind that I'm avoiding the impossibly vague last few variables in the Drake Equation by only asking about complex life, not intelligent life that is sending signals. Anyways, I'm asking for help on this board to brainstorm any variables that I'm missing, and mabye come up with some values for these variables. Perhaps we can get a clearer indication of the probability of life beyond earth. Off the top of my head, the variables I can come up with are:<br /><br />-# of stars in the galaxy<br />-# of sun-like stars<br />-# of single (non-binary) star systems (I think binary systems are a problem?)<br />-average # of planets orbiting these stars<br />-size of planets<br />-are planets in the habitable zone?<br />-correct chemical and mineral conditions for life?<br />-if the planet has tectonic activity<br />-if the planet has a magnetic field<br />-if there are enough climate variations (but not too many) to "challenge" life to evolve<br />-large nearby moon<br />-how circular the planet's orbit is<br />-whether there is a jupiter-type planet in the same solar system sweeping up asteroids<br />-what % of the galaxy is actually habitable? <br />-do we need a nearby supernova explosion to supply minerals, and if so, how many stars meet this requirement? <br />-what % of other galaxies are habitable? <br /><br />That's all I can think of for now. Anyone care to add to this?