What happens when a planet loops back in its trajectory across the sky?

What happens when a planet loops back in its trajectory across the sky?

Here is the question :

WHAT HAPPENS WHEN A PLANET LOOPS BACK IN ITS TRAJECTORY ACROSS THE SKY?

Here is the option for the question :

  • Scintillation
  • Retrograde
  • Backstroke
  • Apastron

The Answer:

And, the answer for the the question is :

Retrograde

Explanation:

[STC0015889]. Some planets’ apparent motions across the sky from Earth will occasionally appear to make a U-turn. For years, astronomers were at a loss to explain why Earth appeared to be moving backwards relative to the other planets in our solar system.

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