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39
votes
How can a photon collide with an electron?
photons
electrons
photoelectric-effect
asked Apr 11, 2020 at 11:20
physics.stackexchange.com
11
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Why does the angular size of the Moon change?
orbit
the-moon
angular-diameter
asked Jan 1, 2021 at 19:07
astronomy.stackexchange.com
9
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Determining the extinction by counting stars?
apparent-magnitude
extinction
asked Apr 21, 2020 at 11:03
astronomy.stackexchange.com
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