Our sun = 1026 W multiply that by the amount of stars at that would be the total energy of the
galaxy is = to the sum of it's parts active galaxies are not.
Active galaxy : Seyfert galaxy spiral, very bright galactic centers. (NGC7742) the fried egg
Population one stars are youger, they were the first one's to be seen, brighter stars are younger
stars.= Metal Rich
Population two came about with improved telescopes and we could see fainter light and fainter
light comes from older stars. Have much less
Our sun made about only 20 diff revolutions.
Halo- made of very diffused material, under 1 percent of mass in galaxy
In the spiral arms, (disk) stars have a circular orbit. They are blue. High mass stars exist for a
shorter time. If the color is blue and
the photon then spils and have matter, and an anti matter part
go from a radiation ( em radition) domimnator universe to a matter (stars galaxies planets)
dominator universe mass of photon= energy of
1. Normal- 10 mil stars
2. Dwarf- by far outnumber the normal 10 kpc, and 100 mil stars
Almost always caused by collision or near collision. All you really need to star formation,
raw materials, low enough temp so gravity can win, and a
Pluto- one of the largest members of the kluto belt.
Inner astrod belt- 3 different classes of asteroids.
1. S class- silicade
2. M class- Metals- one day, we will run out of natural resources. Copper and Zinc. Asterod
belt- contains mass amount of these
Got Milk(y Way)?
For the longest time humans have believed themselves to be the center of the universe.
Turns out not only are we not the center of our universe, our galaxy isn't either. However, more
important than being the
1. homogeneity wherever we look in the universe it's made up of the same stuff everywhere.
Protons, nuetrons, photons, dark matter
2. isotrophy: the universe is isotrophic looks the same in all directions. Clusters, super clusters,
Milky way galaxy ( chapter 24 three spiral, the barred spiral, three lenticular, three irregular)
sombrero galaxy don't know if it's spiral orbarred spiral and is looks like a hat.
Spiral galaxy : Distance ( from center) V.S rotational speed
stars in disc
Asteroid belts are the leftover materials that form the solar system before it was actually formed
it hasn't interacted with sunlight, it's in it's pristine focilite form like it was billions of years ago.
Where did life arise?
If found life on these left