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Turning light again as it was losing mass, a scientific phenomenon (5)

Ross

I believe the answer is:

euler

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This clue could be a double definition.

'turning light again as it was losing mass' is the first definition.
I can't judge whether this defines the answer.

'a scientific phenomenon' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for euler that I've seen before include "Leonhard --, C18 Swiss mathematician" , "Swiss mathematician; sounds like lubricator" , "Noted blind Swiss mathematician" , "Swiss scientist" , "18th-century Swiss mathematician and physicist" .)

I've seen this clue in The Times and The Sunday Times.
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