Space telescopes have tracked the long-term orbital motion of Mars, Jupiter, and Saturn for decades. What prediction can be made from this type of data?

Long-term tracking reveals the planets’ orbital paths and how their positions change over time. Using that information, astronomers can predict when Mars, Jupiter, and Saturn will appear close together in the night sky. The data do not indicate that Earth’s rotation will reverse or that the planets’ orbits will move between Earth and the Sun.

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