Ch 1 homework

5 - Habitable worlds are worlds that have the ingredients and conditions necessary for life. It doesn't need to have life.     10- Astrobiology is the study of life in the universe.  Major areas of research are studying conditions conducive to origin and existence of life, looking for these conditions on planets, looking for actual life elsewhere.      15 - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.     20 - If we fail to find life elsewhere, we have learned important lessons about the conditions that made life on earth possible.