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Here comes yesterday’s answer:
Which of the following objects does not have a place on a standard HR Diagram?
A. Red Dwarfs
B. White Dwarfs
C. Black Dwarfs
D. Red Supergiants
This was...
SpoilerC! A normal HR diagram includes mass, luminosity, and sometimes magnitude. Black dwarfs are theoretical white dwarfs that have cooled down over trillions of years and emit no more light, therefore they do not belong on an HR diagram.
Fact or Crap:
Leeches have 32 brains.