Why does the rotation of our galaxy suggest that it is more ...

[PhilipSeeMore]

Why does the rotation of our galaxy suggest that it is more massive than previously thought?
 
  What will be an ideal response?

Question 2

A(n) ___________________ _ is a cool, dense cloud of dust and gas that is undergoing gravitational contraction.
 
  Fill in the blank(s) with correct word

[diesoon]

Answer to Question 1

The best observations of the rotation curve of the Milky Way show that orbital velocities in the outer disk are constant or even increasing with distance from the center of the galaxy. Those high orbital velocities indicate that the larger orbits enclose more mass and imply that our galaxy has much more mass than is contained within the radius of the Sun's orbit.

Answer to Question 2

protostar

[PhilipSeeMore]

Both answers were spot on, thank you once again

[diesoon]

Great! Please up vote