About how much of the sun's radiation would strike the earth if the earth did not have its atmosphere?

Had to look for the options and here is my answer.

I can say that it would be ten times as much of the Sun's radiation would strike if the Earth did not have its atmosphere. The Earth's atmosphere consists of different layers which are composed of different gases. Each of these play an important role in enveloping and regulating the Earth's internal temperature. Hope this helps.