Philip Johnston

speaker

376 appearances 1 recordings 1 series first heard Aug 2026 last heard 5 Aug

Philip Johnston’s voice in public audio — every appearance, attributed to the second.

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recordings per month · last 12 months

Recordings per month over the last 12 months — 1 in all, peaking in Aug 2026 with 1.

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Y Combinator Startup Podcast · Building the First Data Centers in Space · 5 Aug 2026 podcast

Very similar mechanism, so a liquid-cooled loop.

The challenge with it is making it cheap and light.

So our radiator is at least 10 times less mass per watt of dissipation than the ISS radiator.

and 500 times less cost per watt of dissipation than the ISS radiator.

So very easy benchmark to beat on cost for the ISS.

And then on radiation, it's just a lot of ground testing in different particle accelerators.

So we've done several rounds of testing at the Brookhaven National Lab particle accelerator for heavy ions.

And also there's a cyclotron for high-velocity protons down in Knoxville.

So we ship all of our hardware down there.

My co-founder Addy runs in and out wearing this protective thing.

Addy is a lunatic when it comes to this stuff.

He's like, oh, yes, it's the same as flying transatlantic.

Don't worry about the radiation.

So, yeah, basically you expose it over a 24-hour period to the same radiation dose that you would have in a five-year mission.

And then all of that telemetry and data then informs our choice on both shielding and software to mitigate bit flips.

I think we're the only people in the world now that know where both an H100, a B200, H200 will fail if you blast it with high-velocity protons and heavy irons.

Both, both.

So we do build shielding around it.

There's a lot of it is just component selection.

So for example, all of the SSDs, all the power delivery system, all of the power converters and everything else, we test 10 components and whichever the best one is, we pick.

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