APOD: Night Glows (2017 Apr 18)

Comments and questions about the APOD on the main view screen.
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Re: APOD: Night Glows (2017 Apr 18)

Post by neufer » Thu Apr 20, 2017 4:38 am

Ann wrote:
And Art, I just love that info about the names of different depth layers of the ocean. The names of the top two layers don't tell me much, although I appreciate the pretty color of them - well the pretty color of the layers, not the names. (Perhaps the top one should be called cyanopelagic, or even caerulopelagic?) But the third: Bathypelagic! Where you take bath? And the fourth: Abyssopelagic. Okay, now we're in the abyss! And the fifth, although it's more of a crack than a layer: Hadopelagic. We've finally come to Hades!
bath (n.) Old English bæð "an immersing of the body in water, mud, etc.," also "a quantity of water, etc., for bathing," from Proto-Germanic *batham (source also of Old Norse bað, Middle Dutch bat, German Bad), from PIE root *bhē- "to warm" + *-thuz, Germanic suffix indicating "act, process, condition" (as in birth, death). The etymological sense is of heating, not immersing.

The city in Somerset, England (Old English Baðun) was so called from its hot springs.
"Bathýs" : the Greek word βαθύς, meaning deep.
"Abyss" : the Greek word ἄβυσσος, meaning bottomless.
"Pélagos" : the Greek word πέλαγος, meaning 'open sea'.
https://en.wikipedia.org/wiki/Mariana_Trench#Descents wrote:
<<The Mariana Trench or Marianas Trench is the deepest part of the world's oceans. It reaches a maximum-known depth of 10,994 metres at a small slot-shaped valley in its floor known as the Challenger Deep, at its southern end(, although some unrepeated measurements place the deepest portion at 11,034 metres). The first manned descent was by Swiss-designed, Italian-built, United States Navy-owned bathyscaphe Trieste which reached the bottom at 1:06 pm on 23 January 1960, with Don Walsh and Jacques Piccard on board. The second (and last) manned descent was 52 years later made by Canadian film director James Cameron in 2012. On 26 March, he reached the bottom of the Mariana Trench in the submersible vessel Deepsea Challenger.>>
Art Neuendorffer