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Cake day: June 7th, 2024

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  • The Chinese appear to have figured out orbital refueling (at least for satellites): https://interestingengineering.com/space/china-refuels-satellites-in-earths-orbit

    It’s not clear where that tanker fuel comes from, if it’s being replenished, how long the tanker stays in orbit, and how long it takes to refuel (minutes, hours, days?)

    If the tanker is a one-time disposable vehicle, deorbited once the fuel runs out, it likely won’t be cost-effective. Refueling a satellite then pushing it back into service, you’re not under the same time limit you would be for a reusable rocket that needs to get back down and into circulation ASAP.

    There are a lot of interesting, hard problems. But theoretically, a self-replenishing, reusable tanker could be the most cost-effective way to get to reusable upper stages. Of course, you would need to also solve where to park it so it stays up while still being reachable by LEO rockets. Again, SciFi now.

    I just hope if it’s ever built, they stick a Jetson’s style neon “Gas ⤵️” sign on it.