The great majority of the light emitted by the Milky Way comes from the densely populated central regions, not its perimeter. Astronomers have assumed that light tracks matter since matter emits light. What can one say about the mass gravitationally revealed in the outer regions of the Milky Way

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

Why are graphs useful when interpreting data