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The article discusses how to move to different orbits while using less fuel and it reminds me of the line from Ender's Game [0]:

"Fighting in a gravity well. That means it's cheaper to go down than up."

0 - If you've never read it, I have a short review of Ender's game here: https://alexpotato.com/books/?l=hn#EndersGame

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I highly recommend the second book of the saga.

Same!

And I reviewed that one too: https://alexpotato.com/books/?l=hn#EndersShadow

The second Book Was Speaker for the Dead. The shadow books came out later.

Speaker for the Dead is good, but the series starts to get a bit... weird. Fairly religious, although still in a space-y way. Maybe that was just my middle school take and I should re-read it.

Ender's Shadow (Ender's Game from Bean's perspective) is also excellent.

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