Star⭐️ Flashcards
Nebulas are held together by what two forces?
Gravity and heat
Stars begin from dark clouds of?
Dust and gas
How many stages does our sun go through to become star in main sequence
7
Stage one is called?
Interstellar cloud
What do we call newly formed area that will soon become a star?
Opaque region
Ability to plot movement of a protostar
Evolutionary track
Dark clouds of dust and gas are called?
Nebulas
Nebulas come from? And the matter in between stars is called?
Interstellar space
Two things happen to light when light from stars shines through it?
Reddening- freq of color remain the same
Dims
What is rarer to find in interstellar space? Gas or dust?
Dust - trillion gas molecules and 1 dust
Gas - in 1 cm3 of space is 1 atom of gas
Interstellar space is made up of what two elements?
9% helium
90% hydrogen
Dirty ice is in interstellar is similar to what other body?
Comets
These clouds of dust and gas are so thick they block out all background light
Dark nebula
If a cloud has hot young stars forming within it, it can glow this tho of cloud?
Emission nebula
Reflection nebulas are created by this?
Blue light reflecting
Dark areas amongst nebulas are called?
Dark dust clouds
Absolute zero temperature in kelvin and Celsius?
0 kelvin
-273 Celsius
Key element of our sun or any other star
Hydrogen
In 5 billion years this will be the main element of our sun
Helium
When the helium core “fires up” and the hydrogen burns is called what?
Hydrogen shell burning
As hydrogen burns and temp and size increase in a star what also increases?
Luminosity
How hot does core have to be to fuse helium
10,000,000 Celsius
When helium fuses to into carbon it is called
Helium flash
90% of stars life is spent here?
Main sequence
Low mass stars end life’s?
High mass stars end life’s?
Low= calm High= violent
Death of stars gives universe what?
Heavier elements
Before Big Bang there was this
Hydrostatic equilibrium
As red giant grows and develops it is formed into two distinct areas
Exposed core
Dust cloud
As envelope of red giant is blown off it gets illuminated by the core below. This cloud is called
Planetary nebula
As Core contracts it forms this(not very hot but not to bright)
White dwarf
When white dwarf burns out it becomes
Black dwarf
If a white dwarf releases a lot of energy it is a process called
NOVA
if a NOVA reoccurs over and over again it’s called
Recurrent NOVA
Our sun is called?
1 solar mass star
Where would you find low and high mass stars
Low mass are on bottom
High mass are on top
Stars that are to small to ever ignite into a true star
Clinkers
System of stars with two members
Binary system
Two types of clusters
Open- loose irregular, young stars
Globular- oldest stars, millions, no blue
Chase each other and never twinkle
Visual binaries
Clusters are hard o se and form where?
Nebulas
Supergiants have the strongest what?
Solar wind
In less then 1 second the core of a supergiant can undo all the work that the star has done the previous 10 million years in a process known as
Photodisintegrarion
When the core collapse
Core collapse supernova
Dividing mass long between white dwarf and supernova?
8 solar masses
Type 1 supernovas get mass needed from what?
Binary star
After a star explodes into a supernova the leftovers are called
Supernova remnants
Naturally occurring elements made in the cores of stars? (8 of them)
Helium Sulfur Magnesium Oxygen Silicon Carbon Neon
