Why did the aliens wait until the Robinsons were into the orbit to get their energy source?

Why did the aliens wait until the Robinsons were into the orbit to get their energy source? - Fit smiling sportswoman waiting at gym reception desk

In the Netflix series Lost in Space, we see that the Robot is damaged and its ship has fallen into the planet with the rest of the Jupiter spacecraft.

In the final episode we see that something gets stuck beneath the chariot of the Robinson's and once they are into the orbit the Alien ship comes looking for it.

If they were looking for that thing the whole time, then why didn't they just land on the planet and take it back. Why did the aliens wait until Robinson's Jupiter spacecraft was into the orbit and then they attacked ?






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Why did the aliens wait until the Robinsons were into the orbit to get their energy source? - Glad sportswoman in trendy bra standing near counter in gym and waiting for receptionist while smiling and looking at camera
Why did the aliens wait until the Robinsons were into the orbit to get their energy source? - Unrecognizable man near scoreboard during sports competition





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Images: Andrea Piacquadio, Pixabay, Andrea Piacquadio, Sides Imagery