Origin of Solar System. Lecture 15. Key Propertie s of our Solar System. Any theory of the origin of the solar system must be able to explain following key properties in the simplest manner. Sizes and compositions of terrestrial planets versus Jovian planets
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Any theory of the origin of the solar system must be able to explain following key properties in the simplest manner.
Yet, all known life forms are mainly based on C, H, O, & N, and most advanced organisms are using H2O! Why?
Why shouldn’t there be life forms with iron skeleton and using methanol?
After Big Bang, lightest elements (H, He, Li, Be) were created, but only for a limited time period (3 to 20 minutes).
92% H + 8% He and almost no other elements.
Hydrogen burning :
4 Hydrogens Helium + energy
US yearly energy consumption:
= can light Sanford stadium for 100 billion years!
= can be produced from a fusion of mere 80lb of Hydrogen!
Not much Li (H+He), Be, B (Be+H or He+Li)…
Spinning Figure Skater
collapsed to a nearly 1/1,000,000 of the initial size
Once the collapse begins, nebula would heat up, spin faster, and flatten…
Conservation of Energy (heating up) : gravitational potential energy heat energy
Conservation of angular momentum (spinning up)
High temperatures in the inner region materials only with high condensation temperatures can turn to solids (metals and rocks).
Outer region is much cooler materials with lower condensation temperatures can turn to solids also (ices, rocks and metals) more solids than the inner region!
Hydrogen and Helium remain as gas everywhere in the disk.
Pebbles rocks boulders … planetesimals (~100 km size)
… this process over a few million years…
in a disk surrounding a Jovian planet (similar to the way planets are formed)…
Remaining gas will be blown away by solar wind…
Rocks remain, but gradually being cleared by planets or collide among themselves…
Y E S !
Young stars in their early formation showing a disk (dark shade)