10. How Planets Form

Question 1

What’s need to make planets?

Answer 1

Death of old stars bad big bangs material

Question 2

How to disc form

Answer 2

Dust and clouds
Most of mass passes through a disc before falling onto central proto stat
This is where planets form
Angular momentum means only thin shrunk disk is left orbiting a young

Question 3

How to estimate disc lifetime?

Answer 3

Use infrared patterns on a graph to find age

Question 4

How to discs form planets

Answer 4

Disc forms
Solids condense to form micron sized grains that collide and grow
Form planets , large one attraie gaseous envelope

Question 5

What is escape velocity

Answer 5

When kinetic energy is great than potential energy

Question 6

What is a snow line

Answer 6

Temp of star decreases as radius increases
Hydrogen compounds condense to form ices on solid grain
Explains why ice giants in outer solar systems
Eg origin of Jovian planets