The Solar System
|. . .about 9 billion years after the Big Bang|
|The Formation of our Solar System|
|Conservation of Angular Momentum I|
|I grant you that no sounds are given forth, but I affirm . . . that the movements of the planets are modulated according to harmonic proportions. -- Johannes Kepler, 1619|
Summary of the Solar System
Animation of Inner Planets
|The Farside of the Moon. . .|
The Oort Cloud I
Fate of the Universe
a poem by Leslie C. McKinney, Ph.D
You physicists have become annoying
You can't seem to make up your minds
Did everything come from nothing
Or was nothing all there was to find?
What was that first singularity
And what made it start to inflate?
You say a vacuum is not really empty
As long as energy potentiates?
At time zero there was zero space
But fluctuation took care of that
Now there's space of an ill-defined shape
That's full of live/dead cats.
Continuing on you tell us
That we're here cause CP ain't conserved
I never thought of myself as a leftover
This is becoming absurd.
But the universe is here now
At least part of it, I guess,
How is it you can't find the dark matter
To account for the missing mass?
|And what is this
Permeating like a fog?
Einstein was shamed by his fudge factor
But you've brought it back in vogue.
The news from Canada is distressing
There are too few neutrinos from the sun
But physicists aren't constrained by facts
They'll make three neutrinos from one.
So the Standard Model is in danger
It's time for a paradigm shift,
Well paradigm shift, shmaradigm pfffft,
Will you guys please get over it.
Any idea how the story will end?
Big crunch, cold death, lost souls?
Or a slipper slide to a new universe
Through a slimy little worm hole?
Which confirms my general suspicion
That reality is just theory for this bunch
Waves are particles, particles are strings,
And the universe is the ultimate free lunch.
Leslie C. McKinney, Ph.D.
4.56 to 4.0 Billion Years Ago
name Hadean was coined by geologist Preston
Cloud for the pre-Isuan sequence whose record may not be
preserved on Earth but is better known from Moon rocks.
During Hadean time, the Earth and Solar System formed by coagulation and gravitation contraction from a large cloud of gas and dust around the sun, called an accretion disc. The sun formed the nucleus, shrinking in on itself by gravitational compaction until it reached a stage where it ignited with nuclear fusion and gave off light and heat. The surrounding particles within this cloud coalesced into planetesimals which then aggregated to form microplanets (rather like modern asteroids). The energy of the collisions between the larger microplanets, as well as radioactive and gravitational heating, generated a huge amount of heat. The Earth and other planets would have been initially molten. The Earth and Moon formed from a collision between two previous planets - a mars-sized planetoid and a slightly larger planet.
During this period the heavier molten iron sank down to become the core, whilst the lighter rocks rose to the surface, the lightest of all becoming the crust as a sort of "scum" on the surface. There was also an outgassing of volatile molecules such as water, methane, ammonia, hydrogen, nitrogen, and carbon dioxide. An initial steam atmosphere was made of water from comets and hydrated minerals. Rain fell into proto-ocean 4.3 to 4.4 billion years ago.
Once most of the planetesimals were gone the planetary bombardment stopped and a stable rocky crust formed on the Earth. This is the age of the oldest rocks on earth and also of moon-rocks. Atmospheric water condensed into oceans and proto-life formed in the soup of primordial organic molecules, either in the early oceans or in clay or rocks within the crust itself.
text content © M. Alan Kazlev 1998-2002
Rothschild and Lister
|Theories for the Formation of the Earth's Moon|
| "... the Solar System
was forming, probably within a large cloud of gas and dust...The
sun...shrinking in on itself by gravitational compaction...
began to undergo nuclear fusion and give off light and heat.
Surrounding particles began to coalesce by gravity into
larger lumps, or planetesimals, which continued to aggregate
into planets. ...Because collisions between large planetesimals
release a lot of heat, the Earth and other planets would
have been molten at the beginning of their histories...Sometime
during the first 800 million or so years of its history,
the surface of the Earth changed from liquid to solid (...beginning
a time known as the Archaean)."
-- from www.ucmp.berkeley.edu/precambrian/hadean.html
|Geological Time I, II, III|