R
Right. So what my professor wants to know is what is the lookback time for a flat universe, with no matter, and a density of 10^133 eV/m . Would you know how to go about starting this? OmegaM would be 0 and OmegaK would be 0 right?
Homework Statement
At what rate would stars have to be producing light (how many photons per second per solar mass start) in order for the energy density of photons in the universe be constant? Assume current values of cosmological parameters. Do it for current time.
Homework Equations
e =...
Homework Statement
If the energy density of the vacuum were the value 10^133 eV/m^3 , what would the value of the Hubble lookback time be for such a universe with no curvature and no other matter?
Homework Equations
Possible equation...
...Lookback time = ln(1+z)/H
The Attempt at a Solution...
Ok, after staring at this for an hour, I think all I need help with is drawing it. It goes from NP to the equator, through PM, across equator to 30 degrees east longitude, then back up to equator... That does not make any sense to me on how to draw that. I uploaded the only way that I can think...
Homework Statement
What is the area of a triangle on Earth that goes from the North Pole down to the equator, through the prime meridian, across the equator to 30 degrees east longitude, then back up to the equator? The radius of the Earth is about 6378 km.
Homework Equations
alpha + beta +...