Wolfgang R. Dick

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Questions related from Wolfgang R. Dick

Do you also have problems accessing ResearchGate's help page on Copyright?

The help page on Preprints (https://help.researchgate.net/hc/en-us/articles/14293104044177-Preprints) contains a link to the Copyright section...

21 May 2025 6,086 4 View

Which museums or collections hold 4-prism spectroscopes by Kirchhoff/Steinheil?

The second apparatus used by Gustav Kirchhoff and Robert Bunsen in 1860/61 when they established the foundations of scientific spectroscopy was a 4-prism spectroscope built by Carl August...

29 June 2020 1,159 0 View

Which satellites fly in a chain of 12 satellites or more with equal distances?

This morning (December 2, 2019) at about 6 UTC+1 and at a geographic place of about 52° N 13° E I saw a chain of 12 or more satellites in two groups (5 or more + 7), flying with equal distances in...

03 December 2019 4,662 9 View

Under which conditions can I visually observe the quasar 3C 273 with an amateur telescope?

Recently a colleague asked how far can I look into the Universe with my amateur telescope (i.e. by the eye, not by photography). I found a (German) source saying that the brightest quasar, 3C 273...

08 November 2019 6,511 5 View

Has a solar eclipse on the Moon been observed?

What we see (based on Earth) as a lunar eclipse is a solar eclipse if based on the Moon. Has this been observed already directly? The page https://en.wikipedia.org/wiki/Solar_eclipses_on_the_Moon...

20 January 2019 8,993 12 View

The merits and defects of competition in science

Those who are interested in general questions on how science works, here is an interesting project on the merits and defects of competition in science:...

01 January 1970 3,026 0 View