Describe a psychological challenge of space travel that astronauts can face.

Loneliness

Explanation:

It is logical that an astronaught could be lonely up in space due to the absence of loved ones.

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)