Astronuc's latest activity
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Astronuc replied to the thread History For WW2 buffs!.I heard an interesting story about Elizebeth Smith Friedman. She and her husband were among a few cryptoanalysts during the early 20th... -
Astronuc replied to the thread Undergrad Galaxy MoM-z14 - furthest observed object.It has to do with the resolution of the telescope optical system: collecting sufficient light and focusing that light onto a camera... -
Astronuc replied to the thread Undergrad Galaxy MoM-z14 - furthest observed object.Copying the text did not capture the superscript. It has been corrected -
Astronuc posted the thread Undergrad Galaxy MoM-z14 - furthest observed object in Astronomy and Astrophysics.https://en.wikipedia.org/wiki/MoM-z14 Any photon with energy above 24.6 eV is going to ionize any atom. K, L X-rays would certainly... -
Astronuc reacted to kuruman's post in the thread I want to help Physics education. What should I do? with
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More than 20 years ago I attended a non-technical talk by John Archibald Wheeler which was addressed to the students at the my... -
Astronuc reacted to PeroK's post in the thread High School Estimates — True Size of the Universe? with
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The universe expands because a static universe is not compatible with General Relativity. The universe must either be expanding or... -
Astronuc reacted to Mark44's post in the thread Undergrad Train Wreck Integral Shortcut... with
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Not at all. I'll simplify your problem slightly by getting rid of the fractions. ##\left. x^4\right|_1^2 = 2^4 - 1^4 = 16 - 1 = 15##...