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Milky Way, More Like Water Way
Transcript of Milky Way, More Like Water Way
Are We Alone?
Since man first looked to the stars, we have wondered if a world parallel to ours exists elsewhere in the universe.
The conditions under which life is able to survive on earth are the paradigm we use when determining whether another planet is capable of sustaining life. We use life on earth because it is the only life we know, however we are a nothing of a nothing in the vastness of infinity so there is a likelihood that our life is not the only one.
Life on Earth
Scientists have discovered over 715 planets
Around 23 planets in our Solar System with some traces of water
more in the Kuiper Belt
A Look At Life Beyond Earth
Chance and the Ancients
Math and science flourished during the Greco-Roman era:
Democritus and Epicurus- the universe is the result of chance (jostling of atoms) and the probability of other inhabited worlds is highly likely
Metrodorus of Chios- our "world" being the only one as unlikely as "if a single ear of wheat grew on a vast plain"
Lucretius- "Nothing in the universe is unique and alone and therefore in other regions there must be other earths inhabited by different tribes of men and breeds of beasts." (Lucretius, On the Nature of Things)
Neptune and Uranus
Water vapour in upper atmospheres
Ice in lower atmosphere
Large bodies of condensed gas
Venus, Jupiter and Saturn
Trace amounts of water vapour
We don't know what is under the gas
Too high heat/ pressure
The Moon and Mercury
Accumulations of ice at poles
Proof of water earlier on?
What does water on the moon mean?
Oceans below kept warm/ liquid by Jupiter's tidal effect (possibly hydrothermal vents
Evidence of Hadley Cells
Warm water radiating from the moon's equator
Constant geological activity
Eruptions from ice geysers compromise F-Ring
1000 tons of water into space every hour (organic molecules, salt, et al.)
Warm ocean form Saturn's tidal effect
Gravitational pull causes hydrothermal activity, which warms the ocean and causes geysers
Same "hotbeds" in which life began on earth
Largest moon, bigger than Mercury
100 mile thick ice crust
Warm, salty ocean below?
Furthest Galilean moon: least radiation
Lacks geological activity
Requires anti-freeze compound
"watery dwarf planet with an icy mantle and a slushy ocean below"
Recent observations from Hubble and Dawn
Asteroid belt between Mars and Jupiter
Very close to earth
Once contained vast oceans
Traces of water left on surface
Compounds from ocean's evaporation
Ice shrinks and grows depending on the season
Underground reservoirs containing microbial life?
Evidence of warm past
"Giant mountain peaks"
Similar to Enceladus
Pluto and Charon
Observed as icy world
Orbit of Charon causes Tidal Forces and Pluto's violent formation indicate Pluto may, and still might, have an oceant
Saturn's largest moon
Liquid methane oceans
Most liquid deposits in solar system
Similar in size to earth
Completely covered in ice water
Wobbles as it orbits Mimas
Ocean or oblong core?
Too small to retain heat
Retrograde orbit suggests that it did not form in time with Neptune
Surface of ice and methane
Heating or radioactive decay
Titania, Oberon and Umbriel
Composed of ice and rocks
Could only have liquid water with anti-freeze e.g. amonia
Less likely to have liquid
Bright spot at one pole
Carbon-Dioxide under surface?
Tethys, Rhea and Iapetus
The Kuiper Belt
Asteroid belt surrounding solar system
Contains many icy satellites
Pluto, Eris, Hamua
Water ice surfaces
Saruna, Quaor, Orcus
Cryovalcanism and liquid?
Life On Earth