ASTR 20 Lecture Notes - Lecture 15: Natural Selection, Gas Giant, Low Mass
Document Summary
Too small less gravity no atmosphere no water. Too big most likely will tend to be a gas giant like jupiter no solid. A living organism is something capable of replicating. If life always arises on earthlike planets. Even the simplest life is extremely complex. Simplest organisms has about 1 million base pairs in dna and rna. Life can survive under all sorts of conditions. If life were to be found elsewhere. Those variants best suited to survive are more likely to pass their genetic code to. We only became able to communicate about 100 years ago. N = r * fp * n(e) * f(l) * f(i) * f(e) * l. N = 10 * 1 * 1 * 1 * 0. 1 * 0. 1 * 10,000,000 = 1% of 1 billion = 1 million. Nearest random one is 1,000 lightyears away. If intelligent life is unique to earth then either.
