Dwarf and Neutron Star – Galaxy Evaluation (Astronomy)

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)


Population 1

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


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