According to experiments, the speed of light

Most interstellar matter is too cold to be observed optically. In which part of the electromagnetic spectrum might its radiation be detected?

How many clock cycles does it take for a given input to be processed and reach the output in this datapath?

Extra Credit (2 pts) : It is now known that forces are mediated (carried) by particles that are exchanged between the two objects that are interacting.  The ______ mediates the strong force, whereas the ______ mediates the electromagnetic force. 

What three properties of matter are retained by black holes from their pre-black hole stages?

Briefly describe the process of Hawking radiation. Do black holes live forever?

What is the most important quantity in determining the fate of a star’s death? How does this quantity determine a star’s lifetime? Which stars live the longest, which have the shortest lifetimes, and why?

If the universe is isotropic, then

During the epoch of cosmic inflation, which of these properties of the universe changed rapidly?

The cosmic microwave background radiation is