Astronomy 2232F/G Lecture Notes - Lecture 4: Astrobiology, Thermostat, Heredity
17 Jan 2018
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6 key properties of life: materials in living organisms exhibit some kind of order. Books and rock or have a metabolism) crystals have order but are not alive. It is a necessary condition for life, but alone does not work: living organisms reproduce and are products of reproduction. Mules are: living organisms grow and develop at some point in their life; heredity, living organisms use energy to create and maintain order within cells, alive but cannot reproduce, and are products of reproduction. Viruses cannot reproduce alone because they need a host. Alive or not? (not don(cid:495)t need energy reproduce and to grow. Sweating, panting, bf to maintain continual energy source. Fire conforms to 4 of 5 properties of life but is not alive. The most general definition of (cid:494)what is life(cid:495) is adopted by nasa in (cid:883)(cid:891)(cid:891)(cid:884): life is a self-
