How long is the photons journey from the milky way to earth

There are two routes similar in terrain; however, one route has an incline of approximately 28 degrees, and you must decide on which route to take. what is the maximum road grade that your fully loaded ecv can climb?

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

In science and physics what is the standard unit of measure for speed?