Astronomy 2021A Complete Textbook Note.pdf - Astronomy...

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Astronomy 2021A Complete Textbook NoteIntro Pages 1-6 ASWhat is Astrobiology?“A branch of science concerned with the origin and evolution of life on Earth, and the possiblevariety of life elsewhere.– AS Textbook“The study of the origins, evolution, distribution and future of life in the universe” - NASAWhy Did it Become a Scientific Study?In the mid 1990’s, we started to realize advances in our technology which enabled us to collectinformation and data on things related to life, and eventually ask questions which we previouslylacked the foundations to ask accurately.Is the spiritual advancement of the scientific field of study know as exobiology?Intro Pages 120-124 ASHow do we Look for Extra-terrestrial Life?1959 Giuseppe Cocconi and Phillip Morrison advocate searching for Broadcasts from othercivilization,determined that looking for changes in visible light and radio waves was the best means ofdetecting these techno-signatures1961 Frank Drank creates the drake equation to determine the probable or potential number ofplanets actively emitting these signalsEquation:R =Birth rate of stars suitable for hosting lifeFplanet=Fraction of such stars having planetsNhabitable=the number of planets per planetary system that are theoretically habitableFlife=Fraction of those planets on which life originated and evolvedFintelligence=Fraction of inhabited worlds that developed intelligent life
Fcivilization=Fraction of those plants with intelligent life that developed civilizations capable ofinterstellar communication (Could it not just be one being?)L =The average lifetime of communicating civilizationsThe equation in action:Exoplanet studies will eventual determine the second and third variables, and maybethe FlifevariableIntelligent life:Convergent evolution –animals without shared linieges developing thesame biological traits, seeing eyes in various types of animals, conclusion here is thatcertain biological traits may be evolutionally inevitableTechnology:Next step of Technological intelligence is debatable, it took us a long timeto do so and it is an extension of our use of tools, behaviour not unique to humans onearth. Dinosaurs were around for a long time and theres no evidence that theydeveloped any? EQ = Ratio of brain size to body mass EQ of 1 = avgUnit 1 Pages 14-21 ASIn the Beginning:The universe was initially too hot for atoms to form into complex biologicalmolecules. It was the cooling of the universe which enabled the advent of life.Milky way: is some 100,000 light years across.The Solar System:Exists in the Orion Arm,
The sun:will stop fusing hydrogen when a buildup of lithium “ash” accrues in the core. It willthen cooldown and expand outward at which point the gravity of the star will collapse in onitself, causing the core to reach temperatures upward of 200 million degrees Celsius, ignitingthe process of helium fusion. The sun will sequentially start fusing heavier atoms until it sheds

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Term
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Solar System, Planet

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