Original: This is just one-tenth the solid angle subtended by the full moon as viewed from Earth , smaller than a 1 mm-by-1 mm square of paper held 1 meter away , and equal to roughly one thirteen-millionth of the total area of the sky .
Simplified: This is smaller than a 1 mm by 1 mm square of paper held 1 meter away , and equal to roughly one thirteen-millionth of the total area of the sky .