[Rummyfan]

“The military aspect is aided by investigation of space environment, detection of nuclear device testing, and capability of weapons in space.” The proposal was only initially made public after famed physicist Carl Sagan...

I cannot recall ever having read or heard Sagan described as a physicist.

[Nifster]

Astrophysicist

[monkeypants]

In 1955, he earned a Bachelor of Science in physics. He went on to do graduate work at the University of Chicago, earning a Master of Science in physics in 1956 and a Doctor of Philosophy in astronomy and astrophysics in 1960. His doctoral thesis, submitted to the Department of Astronomy and Astrophysics, was entitled Physical Studies of the Planets.[31][32][33][34]