1) The Solar System probably started as a disk of material in orbit around the (

Question

1) The Solar System probably started as a disk of material in orbit around the (proto-)Sun, some of which ended up condensing into the planets. Estimate the average (number/meter) density of atoms in this disk under the following assumptions: (i) the total mass was 10 times that of the total mass of the planets, (ii) all atoms are hydrogen, (iii) the inner edge of the disk was at 0.30 A.U., (iv) the outer edge of the disk was at 40.0 A.U., and (v) the thickness of the disk was 0.1 A.U. Note: in the Earth's atmosphere, at sea 26 pre-Solar disk is much lower in density! (Mark s: 6)

Explanation / Answer

The Solar System probably started as a disk of material in orbit around the (proto-)Sun, some of which ended up condensing into the planets. Estimate the average (number/meter) density of atoms in this disk under the following assumptions: (i) the total mass was 10 times that of the total mass of the planets, (ii) all atoms are hydrogen, (iii) the inner edge of the disk was at 0.30 A.U.

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