Why can't the dark matter in galaxies be made of neutrinos? A) ...

[torybrooks]

Why can't the dark matter in galaxies be made of neutrinos?
 
  A) We know that dark massive objects, such as planets and neutron stars, are not made of neutrinos.
  B) Neutrinos have zero mass like the photon.
  C) Neutrinos travel at extremely high speeds and can escape a galaxy's gravitational pull.
  D) There are not enough neutrinos to make up all the dark matter.

Question 2

In what wavelength range was interferometry first routinely used?
 
  A) X-ray B) optical C) infrared D) radio E) ultraviolet

[mjenn52]

Answer to Question 1

C

Answer to Question 2

D

[torybrooks]

Thanks for the timely response, appreciate it

[nguyenhoanhat]

Excellent