BIOL 1201 Chapter : Chapter 9 2013 Class
Document Summary
Material created a cloud of gas and dust called a nebula. Crab nebula what is left over from a supernova observed in 1054ad. Away from center (planetesimals), these gain more matter to become planets. Jupiter"s moons (largest: ganymede, callisto, io, europa) io=volcanic_europa=ice covered(best chance of et life) Scientific theory well-tested formulation of how the world works that has not yet been disproved and can be used to make accurate predictions of how related things work. Nebular theory before our solar system began, an ancient star died and ejected the material that we are made from into space. Gravitation between materials in the cloud pulled it inward, increasing spin (angular momentum) Nearest star to earth (5 billion years old) (middle aged) _ composed of hydrogen and helium. Two classes, inner [terrestrial] (mercury, venus, earth, and mars) and outer[jovian] (jupiter, saturn, uranus, neptune) Mercury 40% larger than moon, has no moon of its own, no atmosphere, year is 88 earth days.
