UNIT # 4:
Birth of Stars….lives of Stars:
This is dust and gas that occupy space between the stars.
Stars form out of the dust/gas in space.
We examine the nature of the dust and gas separately.
Dust is ~ 1% of the total visible mass in space.
Obscures our view of distant objects.
Is mixture of:
Elongated, tiny, grains of dirty ice.
Grains of graphite (Carbon).
Light from a star passes through the dust.
The dust particles are ~ same length as blue Delta’s.
The dust scatters blue Delta’s more than red Delta’s.
*NOTE: ABOVE LAST BULLETIN IS ON TEST # 2 QUESTION!
A larger number of red photons pass unhindered through the dust and reach the
Star appears redder than it actually is.
There is ~100 times more gas mass than dust mass in the universe.
The visible universe contains:
< 1% Other.
These are clouds of neutral (=NOT ionized, Hydrogen).
Contain ~ 1% M to 100M
o o. Thecold Hydrogen gas in its ground state (n=1 orbit).
Spin Flip of Hydrogen:
Parallel Spins. Anti-parallel spins (a lower energy state).
The electron can undergo a spontaneous “spin flip”.
From the aligned (=par