Stars Flashcards
The name of our galaxy?
Milky Way
The offical shape of our galaxy?
Pinwheel
How many stars are in our galaxy?
400 billion
A big cloud of dust and gas?
Nebula
The beginning ingredient for everything?
Hydrogen
The result of a cloud of dust and gas being squeezed and compressed?
Heat
What shape do you get as a result?
Disk
The scientific name for a baby star?
Protostar
How can you tell it’s a baby star?
It glows
How hot is a baby star?
2 million
What is the scientific name for an adult star?
Main sequence star
How old is our sun
5 billion
How old is the earth
4.5 billion
What temperature must it reach?
(Main sequence)
18 million
What physical characteristic is going on? (Main sequence star)
Now using fusion
Why is it important our star is stable?
Can sustain life
Which stars are the biggest?
Blue
Which type of stars are the smallest?
Red
Which stars live the longest
Red
Which stars are the hottest?
Blue
Why do we see so few red stars?
Dimmer
How old is the universe?
13.7 billion
How long is the life expectancy for our sun?
10 billion
What is the expected life span for the biggest blue stars?
1 million yrs
What is the expected life span for the smallest red stars?
10 trillion yrs
About what size are the smallest red stars compared to our sun?
10%
How big are blue stars compared to our earth?
150x
Which are the hottest stars?
Blue
When a star stops collapsing it’s called a what?
White dwarf
What stops the collapse of a star?
Electrons
What is the size of a white dwarf
Earth
How dense is it? (White Dwarf)
1 teaspoon weighs a car
After the star has fused the helium what will happen to it?
Make heavier things
What element will start to cause problems?
Iron
What problem does this element cause?
Makes the star collapse
A star exploding is scientifically called?
Supernova
What will stop a star from collapsing?
Neutrons
Where did they come from? (Neutrons in a star)
Squeezing electrons w/protons
How dense is a neutron star?
1 teaspoon weighs Omaha
Sometimes I can see the stars sometimes I can’t, this is called?
Polesar
What causes this? (Polesar)
North and South Poles