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some dusty old rock

magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

some dusty old rock

possibly nothing but a  rock
the Moon(photo_5) is the fifth biggest planetary satellite
in the  solar system and its gravity exerts a strong influence over Earth
Its too small to retain a substantial atmosphere and
geological activity has long since ceased
Yup it's just a dusty old rock
its crust is made of a calcium rich granite like rock
and is about 30 miles thick on the near side and around  46 miles thick on its
far side
Because of its history of meteorite bombardment, the crust is severely cracked.
The cracking extends to a depth of 15miles
and below that  the crust is completely solid
The Moon's upper rocky mantle is solid and rich in silicate's
It has a very thin atmosphere with a total mass of about 22,000lbs
coincidentally just in case you didnt know
that's the same amount of gas released in landing an Apollo spacecraft
The Moons surface temperature varies by about  270C(480F)over a lunar day
and its gravity is 1/6th of the gravity on Earth
the  Lunar atmosphere is escaping all the time but  it is also being constantly replenished
by solar wind
Some photos on how the Moon was formed
photo_1
shows how in a glancing collision between a Mars-sized asteroid and the Earth
a huge amount of  silicate material was jetted away from the Earth's mantle
photo_2
Shows the ejected material forming a massive cloud of gas,
dust and rock, as the heat is radiating away ,the cloud quickly becomes cool
photo_3
shows how the majority of the ejected material went into a circular orbit
around Earth, forming a clumpy doughnut-shaped ring
photo_4
shows rocks growing by mutual collisions until a single body dominated.
The ring sweeping up the remains of all the material until the Moon was born
3 REPLIES
Community Veteran
Posts: 13,921
Thanks: 514
Fixes: 7
Registered: 01-08-2007

Re: some dusty old rock

I watched a program about 6 months back on TV which claimed that the earth itself is actually made up of 2 different planets which (before the moon existed) collided, smashed themselves apart and then gravity of the remaining pieces made them basically bond together causing a chemical reaction triggering the earth to form.
Fascinating program and they even ran computer simulations to test the theory and they worked as predicted. Funny thing is we're only here because of millions of accidents happening in history. Somewhat of a miracle in its own right..
I need a new signature... i'm bored of the old one!
magnetism2772
Grafter
Posts: 983
Registered: 06-06-2010

Re: some dusty old rock

okrzynska try to remember the program
and if you can remember it
could you post the name here
i'd love to watch it
Community Veteran
Posts: 13,921
Thanks: 514
Fixes: 7
Registered: 01-08-2007

Re: some dusty old rock

Sorry but I ain't got a clue about its name!
If I remember right though it might of been that program with the actor from Jurassic park.. I'm not sure though as I watch a lot of 'space' type programs on a lot of channels.
It was basically a new theory which had been floated in the last 5 or so years and the simulations that they ran were incredibly detailed. Fascinating stuff.. I'll see if I can find anything about it online and will reply back if I do.
I need a new signature... i'm bored of the old one!