Some galaxies have regions that are relatively blue other regions appear redder what does this varuation indicate about the differences between these regions?

Blue is hot while the red is cool.

Explanation:

Hot stars appear in blue whereas cooler stars appear to have red hues.

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  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.