It is a difference of scale. Interplanetary means between planets; it takes a ray of light minutes or hours to go from a planet to another planet. Intergalactic means between galaxies; it takes a ray of light hundreds of thousands of years, or even millions of years, to travel that distance.
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Directly. Their difference IS the difference between them.
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speed is how fast you go. distance is how far you go.
The distance between two numbers is the absolute value of their difference.
The distance between two numbers on a number line is calculated by taking the absolute difference between the two numbers. In this case, the absolute difference between 15 and 64 is |15 - 64| = 49. Therefore, the distance between 15 and 64 is 49 units.