When we glimpse the chromosphere at the start and end of ...

[pane00]

When we glimpse the chromosphere at the start and end of totality, its color is:
 
  A) green (the famous flash).
  B) yellow, like the photosphere below it.
  C) red, due to ionized hydrogen at lower pressure.
  D) blue, due to the ionization of nitrogen by the magnetic fields.
  E) white from the moonlight.

Question 2

What do we mean by the singularity of a black hole?
 
  A) There are no binary black holeseach one is isolated.
  B) An object can become a black hole only once, and a black hole cannot evolve into anything else.
  C) It is the center of the black hole, a place of infinite density where the known laws of physics cannot describe the conditions.
  D) It is the edge of the black hole, where one could leave the observable universe.
  E) It is the point of no return of the black hole; anything closer than this point will not be able to escape the gravitational force of the black hole.

[nixon_s]

Answer to Question 1

C

Answer to Question 2

C

[pane00]

Excellent

[Jsherida]

Gracias!