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If two galaxies collide, what is the chance of the stars colliding?
chances are they would not collide
variable stars & how they extend the distance ladder
a variable star is a star thats luminosity changes over a short period of time. by measuring the time it takes to pulsate we can determine the distance
Why are spiral arms so bright?
Because that is where star formation occurs and the young stars are very bright.
Tully-Fisher relation & how it extends the distance ladder
based on redshift and blueshift in the arms of the spiral galaxies, you can judge the luminosity and therefore the distance
The four characteristics of life
grow by eating, ability to react to changes in environment, reproduce & pass on genetic material to next generation, capacity for genetic change - evolution
assumed property of the universe such that the number of galaxies in an imaginary large cube of the universe is the same no matter where in the universe the cube is placed
Huble's Law (V=Ho d)
rate at which a galaxy recedes is directly proportional to its distance from us
light from quasar bending around an object in front of it and making it appear as if there is 2 Quasars
spiral galaxy formation
gas & dust clouds & stars combine, formation is slow, fast rotation causes gas clouds to flatten
comes from emission from black hole, because of accretion disc spiraling toward black hole
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