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HomeGuestsPhilip Johnston
Brandon Severin
Philip Johnston

Philip Johnston

Co-Founder & CEO at Starcloud

Data centers in space

Starcloud

Starcloud

Co-Founder & CEO

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About

Starcloud, which launched as Lumen Orbit, builds data centers in space, first to give other satellites GPU compute, then to absorb the energy demand AI is creating on the ground.[1]Y CombinatorStarcloud company profileYC[2]TechCrunch200 VCs wanted to get into Lumen Orbit's $11M seed roundPress, Dec 11, 2024 Philip is a second-time founder who worked on satellite projects for national space agencies at McKinsey.[1]Y CombinatorStarcloud company profileYC[3]Launch YCStarcloud: Data Centers in SpaceYC Its first launch was planned for November 2025, carrying Nvidia H100s.[4]Deeptech DecodedPhilip Johnston on putting the first H100s in orbit (19:51)Episode

Co-founders

Ezra Feilden

Ezra Feilden

Co-Founder & CTO

Adi Oltean

Adi Oltean

Co-Founder & Chief Engineer

Launch video

Episodes

  • Data Centers in Space: The Future of AI Compute | Philip Johnston, Starcloud

    Oct 3, 202551m
    Watch + transcriptYouTubeSpotifyApple Podcasts

The reasoning layer

Decoded before it's obvious.

Newsletter

EE05 • Meet Starcloud | Building Data Centers in Space Isn't Crazy. It's Math.

EE05 • Meet Starcloud | Building Data Centers in Space Isn't Crazy. It's Math.

AI's energy demands outpace Earth's infrastructure by 2027. Starcloud (YC S24) skipped the bottleneck entirely.

SubstackJul 7, 2025

FAQ

Philip Johnston is the co-founder and CEO of Starcloud, which builds data centers in space.[5]StarcloudCompany websiteCompany He is a second-time founder and previously worked at McKinsey on satellite projects for national space agencies.[1]Y CombinatorStarcloud company profileYC[3]Launch YCStarcloud: Data Centers in SpaceYC

A Y Combinator S24 company putting data centers in orbit, starting with GPU compute for other satellites and moving towards the energy demand created by AI.[1]Y CombinatorStarcloud company profileYC Its case rests on abundant solar energy, radiative cooling and no permitting queue.[1]Y CombinatorStarcloud company profileYC[3]Launch YCStarcloud: Data Centers in SpaceYC

Energy and cooling.[3]Launch YCStarcloud: Data Centers in SpaceYC Space offers abundant solar energy and radiative cooling, with room to grow without the land, grid and permitting limits that hold back terrestrial builds.[3]Launch YCStarcloud: Data Centers in SpaceYC[1]Y CombinatorStarcloud company profileYC

In this episode

  • 2:04What a data center in space actually looks like
  • 8:17The top investor objections and a slide for each one
  • 19:32Why Starcloud launches every year instead of one big bet
  • 20:29Building and launching the first satellite on a $2.5M pre-seed
  • 24:52Processing Earth observation imagery in orbit instead of downlinking it
  • 27:27Why waste heat will force compute off Earth
  • 43:27The worst take: build in space because space is cold
  • 48:04What a 40 megawatt module costs to build and launch

References

Company and YC

  1. Y Combinator, Starcloud company profileAccessed Oct 23, 2026↩abcdef
  2. Launch YC, Starcloud: Data Centers in SpaceAccessed Oct 23, 2026↩abcde
  3. Starcloud, Company websiteAccessed Oct 23, 2026↩

Press

  1. TechCrunch, 200 VCs wanted to get into Lumen Orbit's $11M seed round (Dec 11, 2024)Accessed Oct 23, 2026↩

Episode

  1. Philip Johnston on putting the first H100s in orbit (19:51)↩

Last updated Oct 23, 2026

Brandon Severin

Watch the episode

Oct 3, 202551m
Watch + transcript
YouTubeSpotifyApple
Starcloud

Starcloud

Co-Founder & CEO

On this page

  • About
  • Episodes
  • FAQ
  • References
  • Moments

Moments

  • 2:04

    What a data center in space actually looks like

  • 8:17

    The top investor objections and a slide for each one

  • 19:32

    Why Starcloud launches every year instead of one big bet

  • 20:29

    Building and launching the first satellite on a $2.5M pre-seed

  • 24:52

    Processing Earth observation imagery in orbit instead of downlinking it

  • 27:27

    Why waste heat will force compute off Earth

See all 8 moments

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