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27 votes
Accepted

How does steel deteriorate in translunar space?

The spectral data came from the surface of the material only a few atoms thick which is exposed to hard vacuum. The solar wind has ions of many materials. It is mostly hydrogen, which as an ion is ...
C. Towne Springer's user avatar
18 votes

How does steel deteriorate in translunar space?

Light interacts with fresh metal surfaces in only the first few atomic layers. What makes metals "metals" is the very high electron density, and we can think of that electron "plasma&...
uhoh's user avatar
  • 149k
13 votes

Why wasn't the phosphine in Venus' atmosphere detected by space probes?

From the recently published paper Phosphine gas in the cloud decks of Venus. The presence of PH3 implies an atmospheric, surface or subsurface source of phosphorus, or delivery from interplanetary ...
Fred's user avatar
  • 13.1k
7 votes

What type of information can be gathered from a plot of brightness against wavelength?

In general, a spectrum can tell us about the composition of the source of the radiation, or of any substance between the source and the detector. Each material has its own fingerprint and ...
gerrit's user avatar
  • 11.7k
7 votes

What is the process to produce a chemical composition spectrum of a celestial body?

The spectrum you show from Titan was taken using the IRIS spectrometer aboard Voyager 1. Of course Voyager 2 had one as well. A huge amount of work went into developing and optimizing the design in ...
uhoh's user avatar
  • 149k
5 votes

What instruments and techniques measured Mars' atmospheric D/H ratio which suggests (all of) it's water didn't evaporate after all?

I don't have access to the Science paper in question (would have to register, boo, that ain't open) so I don't see what Scheller et al cited for their D/H sources (the abstract makes it look like the ...
Erin Anne's user avatar
  • 12.3k
4 votes

What is the process to produce a chemical composition spectrum of a celestial body?

They use a tool called a spectrograph. There are a number of ways to make these, one of the easiest to understand is a prism. That prism breaks the incoming light in to a large number of colors, which ...
PearsonArtPhoto's user avatar
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3 votes
Accepted

'Noodle' zigzagging of a mapping spectrometer

Pages 147-148 of The Cassini visual and infrared mapping spectrometer (VIMS) investigation (original), combined with this image being called a noodle, suggests what zigzag might mean: Instead of the ...
Camille Goudeseune's user avatar
3 votes

Where to get Cassini VIMS data and optical transmission spectra of Titan's atmosphere?

This is a preliminary answer, I believe a better answer can be posted, but this will hopefully get you started. Cassini's VIMS or Visual and Infrared Mapping Spectrometer scans a slit across a camera'...
uhoh's user avatar
  • 149k
1 vote

Recommended source for familiarizing oneself with the applications of spectroscopy in planetary science

I think there are relevant techniques to learn here from the terrestrial remote sensing community. Observations in reflected, scattered and transmitted light have all their own difficulties, and ...
AtmosphericPrisonEscape's user avatar

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