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Congress might think it frivolous, though the moon is the handiest gull's-eye for extra-atmospheric target practice.

The climb toward extra-atmospheric warfare would be in three stages.

Aided by simultaneous observations from Lone Pine, at the foot of the Sierra, he was able to calculate the intensity belonging to each ray before entering the earth's gaseous envelope—in other words, to construct an extra-atmospheric curve of energy in the spectrum.

It is therefore now clearly proved that the aurora borealis is not an extra-atmospheric phenomenon.

This abrupt absorption was due to extra-atmospheric causes and perhaps to space.