Space time was designed by David Beckham
How large does a star need to be to form a black hole at its death?
>3 solar masses
Does gravity have an effect on time? Give a light description of how, or an example.
Yes, time appears to move more slowly in the presence of high masses to an observer, Viking-sun-transmission
What is the radius within which light can no longer escape a black hole called? What does it describe?
Swartzchild radius, Event horizon
An amorphous blob with the sun near the center (because density appeared to be the same in all directions)
What is Einstein's equivalence principle?
Gravitational force is indistinguishable from acceleration within a local frame of reference.
(if you have nothing to compare to you cant tell if you're free falling or not experiencing gravitational forces)
Gravitational redshift
What happens to any matter that approaches a black hole (the technical term)
Spaghettification
What shape accurately describes the concentration of mass in the Milky Way?
Spiral with a central bar
Does light obey the equivalence principle?
No
How large would the error be for a GPS satellite in a single day if relative time were not accounted for?
about 7 miles
What is an accretion disc?
A disc of matter pulled from a star orbiting around a black hole moving at nearly the speed of light.
What do farther (younger) galaxies tend to look like?
Lumps of stars with no distinguishable shape
What is the major difference between Newton's and Einstein's understandings and descriptions of space and time?
Newton treats them as separate, Einstein treats them as one cohesive thing
When were black holes first introduced as a concept?
1783 in Cambridge by John Mitchel
What is believed to be the cause of measured gravitational waves?
The merging of two black holes.
What is the Sun's orbital period around the galaxy's center?
225 million earth years
When the experiment measuring apparent position of stars passing close to the sun was preformed in 1919 to test Einstein's theory how close were the results to predictions? In the modern day?
~20% , <1%
How does a black hole work in terms of geometric relativity?
It bends spacetime so much that within a certain distance there is no "Out"
What is the approximate mass of the portion of the galaxy within the solar system's orbit?
100 billion suns