Question

How does scientists determine the speed of a spacecraft on its way to a distant planet

Answer 1

Hey Mate,

Here Is Your Answer

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Astronomers use an effect called parallax to measure distances to nearby stars. Parallax is the apparent displacement of an object because of a change in the observer's point of view. In the diagram below, as the observer moves between the two positions, he would see the same tree, but it would appear to move against the background.


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Hope It Helps You.

Answer 2

In the modern astronomical science the spacecraft are becoming more modern and technologically complex day by day.

We use parallax and other sensors and equipments to determine the velocity of a launched spacecraft.In early days we have calculate the all necessary calculations manually to determine the velocity but now we use supercomputers to do so.