Recap. N = N * f s N * = 4 x f s = 0.2 f p = 1.0. N = 8 x 10 10
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1 Life and fl
2 Recap N = N * f s N * = 4 x f s = 0.2 f p = 1.0 N = 8 x 10 10
3 Solar System 8 planets 3 in or close to habitable zone Extrapolating from one example: f p =1 N h = 3 N = N * f s f p N h = 2.4 x 10 11
4 Where we are going We ll return to habitable zones later First, what needs to be supported?
5 What is Life? And will you know it when you see it?
6 Properties of Life * Produces Order Reproduces itself Grows and Develops Utilizes Energy Responds to the Environment Adapts and Evolves * as we know it, on Earth
7 Definitions of Life Thermodynamic: Produces order. Temporarily overcomes entropy. But are crystals alive?
8 Definitions of Life Thermodynamic: Produces order. Temporarily overcomes entropy. But are crystals alive? Metabolic: Produces energy via chemical reactions. But is fire alive?
9 Definitions of Life Thermodynamic: Produces order. Temporarily overcomes entropy. But are crystals alive? Metabolic: Produces energy via chemical reactions. But is fire alive? Biochemical: Exhibits specific reactions; uses enzymes.
10 Definitions of Life Thermodynamic: Produces order. Temporarily overcomes entropy. But are crystals alive? Metabolic: Produces energy via chemical reactions. But is fire alive? Biochemical: Exhibits specific reactions; uses enzymes. Darwinian: Self-sustaining and reproducing; capable of evolving.
11 The Meaning of Life
12 The Laws of Thermodynamics Energy can be transformed, but never created nor destroyed (conservation of energy) In a closed system, entropy always increases Absolute zero, the complete absence of motion, is unattainable
13 The Alternative Laws of Thermodynamics You can not win You can not break even You can not get out of the game.
14 Entropy Does life, by creating order, violate the second law of thermodynamics? No. Entropy must increase in a closed system. Earth is not a closed system. A decrease in entropy on Earth is more than compensated by the increase in entropy of the Sun.
15 Summary of Properties Produces Order Utilizes Energy Reproduces itself Grows and Develops Responds to the Environment Adapts and Evolves Thermodynamic Metabolic Thermodynamic; Darwinian Darwinian Darwinian Darwinian
16 Evolution Reproduction with Errors
17
18 Earth - a Brief History 4.5 Gya: Earth forms in circumstellar disk 4.4 Gya: Mars-size object collides with the Earth Original atmosphere is stripped Moon forms in debris disk 3.9 Gya: surface is pulverized in the Great Bombardment 3.8 Gya: Oldest rocks; evidence for life C12/C13 isotope ratios 3.5 Gya: first fossils (stromatolites)
19 Life on Earth - a History All life on Earth is related: It shares common biochemical mechanisms It shares common DNA sequences Arose early on: first records about 3.8 Gya - about 100 million years after the great bombardment Arose under adverse conditions Evolved fast: Essentially modern fossils by 3.5 Gya
20 Elements of Life
21 Tree of Life
22 Classification of Life on Earth Domain Archaea Bacteria Eucarya Kingdom Phyla Class Order Family Genera Species The original Linnaean system began with the Kingdom (Plants, Animals, Fungi, Protists, Bacteria)
23 Your Classification Domain : Eucarya (multicellular) Kingdom: Animalia Phylum: Chordata (notochord) Subphylum: Vertebrata (spinal cord) Class: Mammalia Subclass: Theria (live birth) Infraclass: Eutheria (placental) Order: Primatia Suborder: Anthropoidea Infraorder: Catarrhini (Old world monkeys) Family: Hominidae (hominids) Genus: Homo Species: Sapiens
24 It s a Long Way from Amphioxus
25 What All Life * Has In Common Carbon-based Water-soluable Organized into cells DNA/RNA-based genetic material * On Earth
26 Carbon Atomic number 6 (6 protons) 4 th most abundant element Isotopes: C 12, C 13, C 14 Valence +4 Can form stable Single, double, or triple bonds Readily forms long chains Forms closed rings
27
28 Why not Silicon? Si also has valence = +4, but: Si does not readily form double or triple bonds (the nucleus is larger, bonds must bend more) Si-Si bonds are half the strength of C-C bonds Si-H and Si-O bonds are stronger than Si-Si bonds C-H and C-O bonds are as strong as C-C bonds Si-O chains (silicone) are stable and unreactive SiO 2 (quartz) is very stable Si does not form rings
29 Water (H 2 O) Abundant Easily made, stable Liquid over wide temperature range Permits wide habitable zone High heat capacity, high heat of vaporization Moderates temperature fluctuations Good solvent a polar molecule Non-reactive High surface tension UV self-shielding Solid less dense than liquid Ice floats
30 Other Solvents Solvent Temperature Range (C) Heat Capacity (Cal/gm/C) Heat of Vaporization (Cal/gm) Relative Surface Tension Relative Solvency Water H 2 O Ammonia NH 3 Methyl Alcohol CH 3 OH
31 Cells A membrane keeping the cellular mechanisms Inside, and the rest of the work outside. May or may not contain a nucleus
32 Extreme Life Viruses and Prions Extremophiles Thermophiles (heat) Psychrophiles (cold) Halophiles (salt) Chemautotrophs (inorganic reactions)
33 Evolution - A Fact of Life
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