AST251H1 Lecture Notes - Lecture 2: Kuiper Belt, Chemical Element, Body Force
Document Summary
Itself creates gravity enough to overcome rigid body forces hydrostatic equilibrium shape. Tiny objects in the solar system that can eventually become comets. They often surround the orbits of pluto and eris. Therefore, pluto does not count as a planet because the kuiper belt surrounds its orbit. Can describe using characteristics (e. g. adaptation, growth, homeostasis ) Would be hard to measure these characteristics if we are observing planets from light. Nasa definition of life: life is a self-sustained chemical system capable of undergoing years away. Chemical element in the universe: 92. 7% hydrogen, 7. 2% helium, 0. 1% oxygen. Chemical element in earth"s crust: mostly oxygen (59. 7%), silicon (19. 9%), hydrogen (3. 1%), the rest in small amount are sodium, iron, magnesium, calcium, and aluminum. Chemical element in human body: 62. 1% hydrogen, 24. 1% oxygen, 12% carbon, 1. 2% Carbon has valence electrons of 4 readily available to bond with other molecules and turn into complicated structures. Si can also accept 4 electrons and form long-chain molecules.
