PHYS 005 Lecture Notes - Lecture 21: Negative Mass, Deinococcus Radiodurans, Psychrophile
5 Jul 2018
School
Department
Course
Professor
5/30 Extraterrestrial Life Cont.
Finding extremophile bacteria
●Jupiter- Europa
○Hypothermic vents that provide nutrients for bacteria
●Enceladus
○moon/ice crust create?
●2 sunsets
Acidophile or Alkaliphile
●Live in extremely acidic/basic conditions
Cryophile
●Digging 6 miles into ice
●Very cold planets
○Enceladus, europa, titan might have cryophile organisms
■Titan **lakes of methane
Rogue planet
●*no host stars
○EJECTED from the host star
○Always in darkness
○**planets cannot form w/o a star
Piezophile
●In caverns/deep in ocean
○Withstand thousands of times of weight
■**suggests that Mars has life
●Fresh water on Mars
Radiation Resistant Bacteria
●Deinococcus radiodurans- can withstand 3 trillion banana radiation
○Suggests life in exoplanets in neutron stars
Intelligent Life
●Carls Sagan- able to communicate w. Individuals DIFFERENT fr themselves & interest of doing so
(want to)
○Ex. pets
Drake Equation
Answers
●How many civilizations exist in the MILKY WAY @ a certain amt of time
Document Summary
Hypothermic vents that provide nutrients for bacteria. Enceladus, europa, titan might have cryophile organisms. Deinococcus radiodurans - can withstand 3 trillion banana radiation. Suggests life in exoplanets in neutron stars. Carls sagan- able to communicate w. individuals different fr themselves & interest of doing so (want to) How many civilizations exist in the milky way @ a certain amt of time. N- number civilizations in our galaxy where radio communication is possible. F p - fraction of stars that will form planet. N e - avg number of planets/ satellites that can potentially support life per star. All 5- europa, enceladus, mars, earth, titan. F l - fraction of planets that will go on to develop life. Believe that eventually, all (100%) of stars will form planets. Mars must have done it @ 1 point. F i - fraction of planets w life that developed intelligent life.
