Dwarf and Neutron Star – Galaxy Evaluation
In this lesson, we discuss an astronomical evaluation of our galaxy focusing on dwarf, neutron star, supernovae and black holes.
1 teaspoon of white dwarf matter equals
1 ton
yellow dwarfs are ____ of years old
billions
red dwarfs are ____ solar mass(es)
less than 1
what holds a white dwarf against the collapse of gravity
electron repulsion forces
1 teaspoon of neutron star equals
a mountain
blue dwarfs are ____ solar mass(es)
10 to 100
the electron must sit where to become a white dwarf
the nucleus
yellow dwarfs are ____ solar mass(es)
1 to 3
blue dwarfs are ____ of years old
millions
red dwarfs are ____ of years old
trillions
holds a neutron star against the collapse of gravity
nuclear force
yellow dwarfs are ____ of years old
billions
a sun shrunk to the size of the earth
white dwarf
closest star to us; 4.2 lightyears away
alpha centauri
a white dwarf that emits radiation in an intermittent fashion
pulsar
a sun shrunk to the size of boston
neutron star
holds typical stars against the collapse of gravity
gas pressure
the surface of the sun is ____ degrees celsius
6000
the core of the sun is ____ degrees celsius
10 million
surface area times temperature
luminosity
the sun is a ____ star (classification)
g2
luminosity, star diameter and surface temperature all depend on a star’s ____ and ____
mass, age
the more negative the luminosity, the _____ it is
brighter
the color of a star correlates with _____ temperature
surface
the diameter of the sun is ____ earths and the volume is _____ earths
100, 1 million
a dwarf star is burning ____ into ____
hydrogen, helium
a giant star is burning ____ into _____
helium, carbon
the largest stars become the ____ and the coolest stars become the ____
smallest, hottest
the type of supernovae where one binary star “eats” the other; a white dwarf engulfs the gas from a red giant and detonates
type 1
the type of supernovae which is a catachlysmic collapse of a single star three times greater than the size of our sun
type 2
Sagitarius A*
What is the name of the black hole at the center of our galaxy?
3.26 million
How much does the black hole at the center of our galaxy weigh?
.02 AU
What is the schwarzschild radius of our black hole?
13 billion years old
About how old is our galaxy?
disk, bulge, galactic center, galactic halo
4 parts of a galaxy
150-200
How many globular clusters are there?
oldest stars
What do globular clusters contain?
galactic halo
Where are globular clusters?
randomly
How do globular clusters move?
WHIM
What do we have in between galaxies?
warm hot intergalactic medium
What does WHIM stand for?
120,000 LY
How big is our galaxy?
6×10^11
true weight of our galaxy
2×10^11
star weight
over 300 billion
How many stars are there in our galaxy?
8 kiloparsecs
How far away are we from the center of our galaxy?
200 one
At the center of our galaxy there are ____ stars in ____ parsec(s)
any stars in the disk
Population 2
any stars in the halo
local group
name of our galactic neighborhood
50+
How many galaxies are there in the local group?
220 km/s
How fast are we moving?
225 million years
our galactic year
70%
What percentage of the universe is made up of dark matter?
MACHOS and WIMPS
Two types of dark matter
massive compact halo objects
MACHOS
nteracting massive particles
WIMPS
RR Lyrae
low mass stars – accurate
Cepheid
high mass stars – not accurate