Astronomy 1040 test 3 uvu – Flashcards
Unlock all answers in this set
Unlock answersquestion
How stars begin: cloud of gas, and dust
answer
Life track of the sun/high mass star 1. Molecular hydrogen cloud
question
The cloud collapses due to gravity and becomes a_____
answer
Life track of the sun/high mass star 2. Dense core
question
In about a million years a small, hot, dense, core called a ____ forms
answer
Life track of the sun/High mass star 3. Prostar
question
When the temperature reaches 10,000 k in the core, fusion begins and transforms the prostar into a ________
answer
Life track of the sun/High mass star 4. Main sequence star
question
Like the sun, remain on the main sequence for about 10 billion years or longer
answer
Life track of the sun/high mass star 5. Low mass stars
question
Hydrogen fusion begins in a shell around the core and the star expands into a _____
answer
Life track of the sun 6. Red giant
question
After most of the hydrogen is fused into helium, helium fusion begins in an event called the _____
answer
Life track of the sun 7. Helium flash
question
Stars can become unstable and turn into pulsating stars like _____
answer
Life track of the sun 8. R.R lyre variables/cepheid variables
question
As a star burns helium into carbon, the radiation pressure pushes the stars outer atmosphere away from the core creating a _____
answer
Life track of the sun 9. Planetary nebula
question
This leaves an exposed core called a _____. These have about the same diameter as the earth.
answer
Life track of the sun 10. White dwarf
question
When a high mass star exhausts the hydrogen fuel in its core the star ___________ and giants burn to helium.
answer
Life of a high mass star 6. Leaves the main sequence
question
The star becomes a _______ after millions of years of helium fusion
answer
Life of a high mass star 7. Red super giant
question
When helium is depleted, fusion of heavier elements begins. This process is called ______ -the biggest element a star can make is iron
answer
Life of a high mass star 8. Nucleosyntyesis
question
A star with an _____ is out of fuel.... It is DONE -iron atoms cannot fuse and release energy
answer
Life of a high mass star 9. Iron core
question
The core collapses due to reduced pressure converting the iron core into _____
answer
Life of a high mass star 10. Mostly neutrons
question
The core pressure then surges and lifts the outer layers from the star in a titanic explosion
answer
Life of a high mass star 11. A supernova
question
-less than 8m(mass of sun) on the main sequence -becomes white dwarf
answer
Low mass stars
question
-Less than 40m(mass of sun) on main sequence - becomes neutron stars(3m>m>1.4m) -neutron degeneracy
answer
High mass stars
question
if stellar core has more than 3 solar masses after a supernova no known force can halt collapse
answer
Super massive stars Black hole
question
Are stellar remnants for low mass stars - found in the centers of planetary nebulas - diameters about the same as the earths -less mass than the Chandrasekhar mass
answer
White dwarf
question
Stellar explosion
answer
Nova
question
A stellar explosion that marks the end of a stars evolution -the star releases more energy in just a few minutes than it did during it's entire lifetime
answer
Supernova
question
Occur in binary systems in which one is a white dwarf
answer
White dwarf supernova
question
Occur when a massive stars iron core collapses
answer
Massive star supernova
question
Astronomers in china witnessed a supernova within our galaxy
answer
July 4, 1054
question
After The explosion of a massive star, a huge glowing cloud of stellar debris steadily expands
answer
Supernova remnant
question
After a supernova the exposed core is seen as a_____
answer
Neutron star
question
If the neutron star is more than 3 solar masses, the core becomes a _____ -light cannot escape
answer
Black hole
question
Rotating, magnetized neutron stars
answer
Pulsar
question
Beams of radiation emanate from the magnetic poles
answer
Light house model
question
Neutron stars that appear to us as pulsars rotate about once every second Before a star collapses to a neutron star it rotates once every 25 days
answer
Rotation rates of pulsars
question
Conservation of angular momentum
answer
Why such a big difference in the rotation rates of pulsars?
question
Actual place where all the mass of the black hole is.
answer
Singularity
question
The stretching out of going into the black hole
answer
Spaghettification
question
Possible chances of holes in the universe, may exists but we don't know.
answer
Worm hole
question
Distortion caused by mass, like a bed sheet and bowling ball
answer
Space-time
question
Point of no return- go straight into the black hole
answer
Event horizon
