Atomic number refers to ________. Fill in the blank(s) with ...

[fbq8i]

Atomic number refers to ________.
 
  Fill in the blank(s) with correct word

Question 2

Briefly explain why astronomers think that dark matter must be composed of Weakly Interacting Massive Particles (WIMPs) rather than difficult to see normal objects like planets, brown dwarfs, and the faintest low mass main sequence stars.
 
  What will be an ideal response?

[Brenm]

Answer to Question 1

the number of protons in an atom

Answer to Question 2

Measurements of deuterium abundance indicate that the total amount of normal matter (which would include planets, brown dwarfs, and stars) cannot account for the total mass observed in galaxies. Observations of the mass distribution in colliding clusters shows that the dark matter passes right through the collision, while the normal matter gets caught up in the middle.

[fbq8i]

TY

[Brenm]

You're welcome