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The spectra of planetary nebulae reveal another interesting fact: they are expanding from the central star at 24 56 km (15 35 miles) per second.
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The short-term solar variability influences the spectrum of planetary waves in a wide spectral range from a 10-day phenomenon to periods involving the extra-long period wave band.
The infrared spectra of proto-planetary nebulae display broad emission plateaus at 8 and 12 μm, which probably originate from a collection of different in-plane and out-of-plane bending modes of aliphatic groups attached to aromatic rings (Kwok et al., 2001).
The spectrum of the planetary nebula is basically the same as that of the H II region; it contains bright lines from hydrogen and helium recombinations and the bright, collisionally excited forbidden lines and faint recombination lines of other ions.
Fig. 3. ISO SWS01 spectra of the young planetary nebula IRAS 21282+5050 and the proto-planetary nebula IRAS 07134+1005, showing various aromatic C-H and C-C stretching and bending modes at 3.3, 6.2, 7.7, 8.6, and 11.3 μ m.
His early work centred on the study of planetary spectra (the characteristic wavelengths of the light from the planets) to obtain data on the planetary atmospheres; it was published in his Spectra der Planeten (1874; "Spectra of the Planets").
After the recent discovery of the far UV lines of Ar VII in the spectra of very hot central stars of planetary nebulae and white dwarfs, the present -and may be further- results can be used also for the corresponding future spectral analysis.
The dynamics of planetary gears show a rich spectrum of nonlinear phenomena.
The first convincing detection was recently made by Cami et al. (2010), who detected C60 and C70 in the Spitzer/IRS spectrum of the young planetary nebula (PN) Tc 1.
Hundreds of planetary systems are known.
This is a sight of planetary strangeness.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com