@gamartinez0 asked 10 months ago.

The allows us to determine how fast mars is moving toward or away from us?

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@Gaurii answered 9 months ago.

 Doppler effect

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@shubhi answered 10 months ago.

The reason we care about how fast Mars is moving toward or away from us is because it lets us determine how long it will take for us to get to Mars. We use the speed that Mars is moving relative to us and the distance between us to determine how long it will take to get to Mars.
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@shivi answered 10 months ago.

Light travels at about 186,000 miles per second. This means that if you shine a light up into the sky, it will take light about two minutes to get from the earth to the moon. This is why the moon appears to be the same size as the sun when it is close to the horizon.
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