Is it possible that earthly life came from outer space

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Is it possible that earthly life came from outer
space?
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A Bit of (probable) History

• More than 4 billion yrs ago a cloud of
  interstellar gas collapses to create the Sun and
  the planets.
• About 4.5 yrs ago Earth created.
• The moon possibly a chunk of earth blown off
  with a collision with a very large planetary
  object.
• There are rocks dating 3.9 billion yrs ago that
  have isotopic fingerprints of organic carbon.
• Microfossils in rocks dating 3.5 billion yrs
  ago a sign of flourishing life.

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Water in Space

• The most common ones Ordinary Chondrites-
  contain 0.1 water
• Asteroids from the asteroid belt contain up to
  20 water.
• Comets half ice, half dust. The water and the
  dust contain high percent of deuterium.

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The Origins of Water on Earth

• ?

Your guess is probably as good as any other
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Meteorite Showers The Heavy Bombardment Period
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The Beginning of Life the creation of organic
molecules.

• Miller created the presumed primeval earths
  atmosphere in a flask.
• hot springs in the bottom of the ocean.
• Space.

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The Asteroid

• Comets Dust particles from comets contain up to
  50 organic carbon, 10 on average.
• Asteroids mostly metal and rock. Some contain
  many organic compounds, including 70 amino acids.
  A little more Ls than Ds.
• Organic molecules exist in interstellar dust.

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Did Organic Raw Material Come From Space?

• Even if they did, their origin is unclear.

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A meteorite crash

• The rear part of the comet is much cooler than
  the front which means it could arrive as liquid
  water with organic compounds.

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The light gas gun
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From a.a. to peptide
Liquid chromatography- mass spectrometry of the
aas and peptides.
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ALH84001

• 1.94kg
• Made of Silicate rich rock
• Has Carbonate minerals assemblages, 1-500µm,
  created in bacteria friendly temperatures on the
  surface of Mars.

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The magnetite crystal

• Magnetite Fe3O4

• The inner and outer rim of the core are composed
  of tens of magnetite crystals in Mg and Fe rich
  carbonate matrix.

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Magnetotactic bacteria

• Live in sediments of many freshwater marine
  habitats
• When put in a magnetic field, magnetotactic
  bacteria move along the field lines and
  concentrate in the north

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The magnetosome
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The Crystal Structure

• These crystals are a biological marker there is
  no known way other than biological to create them
  so perfectly.

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What is Life?

• Is Life inevitably dependant on water?
• Is life always organic compounds?
• What differs something alive from not alive?

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