Missing sial, iron, and nickel explains Fermi paradox (secondversion)

FACT: The oldest minerals found on Earth are zircons
from Jack Hills in Western Australia. They crystalized
about 4.4 billion years ago. Their oxygen isotopic
composition indicates that more than 4.4 billion
years ago there was already water on the surface
of the Earth. The Earth's crust and all minerals
younger than the zircons are about 4 billion years
old.

FACT: About 4.2 billion years ago at least 20
asteroids having diameters between 200 and 500 km
collided with the Mars.

HYPOTHESIS: 4.2 billion years ago the enormous
gravity of Jupiter hurled Theia toward the Earth.
As Theia was moving toward the Earth, its mantle of
liquid water was vaporized by the sunlight, creating
watery atmosphere. Theia became very large comet.
Its rocky core collided with the Moon, thus creating
a new, hot Moon. A few hours later Theia's watery
atmosphere collided with the Earth.

When the collision separated Theia's rocky core from
its atmosphere, the atmosphere quickly expanded due
to the heat generated by the collision, and due to
reduced gravity (no core). The expansion reduced
density of the atmosphere before the collision with
the Earth.

Initially, the collision produced extremely strong
winds on the Earth and only moderate rise of
temperature because the hot mixture of gas and dust
radiated the heat away. The wind was so strong that
it lifted dust from the surface of the Earth and
launched it into space. Some of this dust was made
of zircons that crystallized on the Earth 4.4
billions years ago.

When the main body of Theia's atmosphere collided
with the Earth, it ablated most of the Earth's sima
except the back 30% of the Earth's surface. The
original crust was made of 20 km thick sial layer
on top of 10 km thick sima layer. Some of the
original sial layer near the back of the Earth was
not ablated by the collision, but it was pushed
by the collision towards the back of the Earth
where it piled up and formed the very thick sial
layer that is now known as the continents. The
heat of the collision briefly remelted the sial.
The hot, liquid sial did not spill over the entire
surface of the Earth because its heat quickly
dissipated to cooler interior of the Earth.

Dust particles made from the sial, the zircons, the
Moon, and the rocky core of Theia were suspended
in the atmosphere that enveloped the Earth and the
new Moon. The atmosphere was so large that it
enveloped Venus, Mercury and Mars. It was probably
shaped like a disk. Surface temperature of Mercury,
Venus, Earth, and Mars dropped because the
atmosphere scattered sunlight away from the ecliptic.
Some of the atmosphere was captured by the new Moon.
Large quantity of the dust and larger debris fell
on the Moon, Earth, Mercury, Venus, and Mars over
a period of several thousand years.

Some dust captured by the Earth did not melt because
its descent was slowed down by the huge atmosphere
of the Earth. The new, acidic atmosphere dissolved
all 4.4 billion year old grains of dust except zircon.
Some of this zircon dust survived till present.

Most geologists believe that a grazing collision
between the Earth and a solid, Mars-sized body
transported lots of sial from the Earth to the Moon.
They cannot explain why the collision did not melt
the 4.4 billion year old grains of zircon. The
presence of these ancient grains of zircon proves
that the collision was not a collision between
solid bodies.

The first post in this thread:
http://groups.google.com/group/sci.a...q=Missing+sial