The galactic _______________ contains very little gas and dust, ...

[imanialler]

The galactic _______________ contains very little gas and dust, old stars, and globular clusters.
 
  Fill in the blank(s) with correct word

Question 2

The _______________ states that an observer cannot distinguish locally the difference between inertial forces due to acceleration and uniform gravitational forces due to the presence of a massive object.
 
  Fill in the blank(s) with correct word

[Fayaz00962]

Answer to Question 1

halo

Answer to Question 2

equivalence principle

[imanialler]

Gracias!

[yeungji]

Thanks for the timely response, appreciate it