ASTR 1345 1st Edition Lecture 18 Outline of Last Lecture I. Planetary SystemsA. Solar NebulaB. Protoplanetary DisksC. AccretionII. Five Essential Things to do in SpaceIII. Theory of Solar SystemOutline of Current Lecture I. Origin of the Solar SystemA. Terrestrial Planets vs Gas PlanetsII. Layers of the AtmosphereA. TroposphereB. StratosphereC. MesosphereD. IonosphereCurrent Lecturel.The Earth is made of 74% Helium, 25% Helium, and 1% consisting of heavier elements. A c,oud gas collapses if it has a low temperature, so that the outward thermal pressure is small, or high density so gravitational pressure causes the cloud to collapse inwards. It also collapses if the disk is rotating. The rotation of the Earth would be faster without the Moon. Earth developed a permanent atmosphere because speeds imparted to the gases of the second atmosphere by sunlight were not high enough to enable them to leave Earth’s gravitational bonds. Helium and Hydrogen, through geographical change, formed volcanoes that created CO2 and those 3 then created toxic water and very primitive bacteria. Then the CO2 was converted to oxygen by early plant life.A. Terrestrial planets are mostly solid, have a lower mass, slower rotation, higher density, no rings and fewer moons. Gas giants are mostly fluid, have a higher mass, fast rotation, lower density, rings, and many moons.ll.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.A. The troposphere is the lowest level of Earth’s atmosphere. Which is where all of Earth’s weather occurs. 75% of the mass of the atmosphere lies in this layer. Temperature drops from an average 290K at ground level to 218K at 11 km. Convection causes the weather. It causes hotter air near the ground to rise and cooler denser air to fall.B. The stratosphere is the 2nd layer in Earth’s atmosphere in the realm of the ozone layer. Temperature increases because of the ozone layer.C. Mesosphere is the 3rd layer above the stratosphere. Temperature drops to a minimum of 200K.D. The ionosphere or thermosphere is the 4th layer above which the Sun’s ultraviolet radiation heats and ionizes atoms, producing charged particles that reflect radio
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