There are about 400 stars from 3rd to 4th magnitude in the sky, and from 4th magnitude to 5th about 1100.

There are about 400 stars from 3rd to 4th magnitude in the sky, and from 4th magnitude to 5th about 1100. Which of them together brighten the Earth?

The total brightness of the first group is approximately -3 stellar magnitudes, and the second -3.1, therefore, both groups are practically equal in total brightness.

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