philip johnston

T2 · manager / operator

Co-founder and CEO of Star Cloud, building data centers in space. Led the first deployment (Star Cloud 1) with five Nvidia GPUs including an H100, achieving first model training in space. Filed with SEC for 88,000 satellite constellation delivering 20GW compute capacity.

23 calls·12 names·74% bull·last heard 6 days ago·Y Combinator+3

track record

no scored calls yet — needs a stated position or a categorical verdict, with a matured window vs SPY

top calls

highest conviction · one per company

1sthigh conviction

$STARCLOUDStarCloudposition

StarCloud targets 20GW+ orbital compute constellation as Starship slashes launch costs

Terrestrial data centers face insurmountable energy, water, and regulatory constraints; space-based solar provides unlimited power at $500/kg launch break-even (vs $50/kg for space-based solar). Starship's 3-ships/day production enables 1000x launch capacity, making 88,000-satellite constellation (20GW+) economically viable. First commercial product StarCloud 2 (10kW) serves gov/military; StarCloud 3 (200kW) targets hyperscalers by 2028.

Y Combinator2026-08→

2ndhigh conviction

$BENCHMARKBenchmarkposition

Benchmark leads $170M StarCloud bet on elite SpaceX/hyperscaler engineering team despite SpaceX conflict

Partner Chetan Puttagunta invested after deep diligence on engineering team (half ex-SpaceX, half ex-hyperscalers) despite SpaceX's competing space data center project creating conflict for other VCs. Bet on team's ability to solve 'impossible' thermal/radiation problems rather than market reports. First space investment for Benchmark; round accelerated after team visit.

Y Combinator2026-08→

3rdhigh conviction

$SPCXSpaceXposition

SpaceX IPO will be historically most undervalued, heading to $10T+ valuation

SpaceX owns the most cost-effective launch vehicle (Starship), which unlocks every other space industry — asteroid mining, lunar resources, communications — making it the 'railroad' of the space economy with nearly unlimited TAM.

Sourcery VC2026-07→

most discussed · click a bar to filter

recurring themes

23 total

$STARCLOUD

StarCloud

HIGHphilip johnston·Y Combinator·6 days ago· position

StarCloud targets 20GW+ orbital compute constellation as Starship slashes launch costs

"We are very quickly running up on constraints on where we can build new energy projects terrestrially. And so by building them in space, we get access to this almost unlimited low…"

1:09

$BENCHMARK

Benchmark

HIGHphilip johnston·Y Combinator·6 days ago· position

Benchmark leads $170M StarCloud bet on elite SpaceX/hyperscaler engineering team despite SpaceX conflict

"I think basically he saw a really really strong technical team doing something that if it worked could be incredible... he spent a lot of time with the team... we literally have t…"

24:32

$NVDA

···

Nvidia

HIGHphilip johnston·Y Combinator·6 days ago

Nvidia co-designing space-qualified 'Reuben' GPU using StarCloud's unique orbital radiation data

StarCloud is the only entity with operational data on H100/B200/H200 behavior in space radiation environment (tested at Brookhaven and Knoxville cyclotron). Nvidia leveraging this to co-design 'Reuben' space chip: stripping AC/DC converters, cold plates; stiffening boards; radiation hardening. Partnership validates commercial GPU viability in orbit and creates feedback loop for space-hardened silicon.

"We're working very closely with Nvidia. Um they we recently announced this uh Reuben space Reuben one chip that we're working with them on. Uh so that's designed for the space env…"

21:32

$SPCX

···

SpaceX

HIGHphilip johnston·Y Combinator·6 days ago

Starship gigafactories targeting 3 ships/day will unlock 1000x launch capacity, enabling orbital data centers

Starship program building two gigafactories for 3 ships/day production; reusability yields 1000x launch capacity within 3-4 years. Launch cost trending down rapidly toward $500/kg break-even for space data centers. StarCloud booked rideshare, signed Starlink laser terminal contract for 20 satellites. SpaceX reportedly pursuing same space data center concept (conflicted VCs out of StarCloud round).

"They're building these two Starship gigafactories. They're designed to produce something like three Starships per day. And because Starship is reusable, you know, on a sort of thr…"

1:43

$SPCX

···

SpaceX

HIGHphilip johnston·Y Combinator·6 days ago

Starship enabling 1000x launch capacity; SpaceX pursuing space data centers

Starship's reusable architecture (3-4 ships/day from gigafactories) will drive launch costs to ~$500/kg, making space data centers economically viable. SpaceX is also building its own space data center capability, creating competitive validation but also conflict for investors with SpaceX positions.

"They're building these two Starship gigafactories. They're designed to produce something like three Starships per day. And because Starship is reusable, you know, on a sort of thr…"

1:54

$AMZN

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Amazon Web Services

MEDphilip johnston·Y Combinator·6 days ago

AWS partnering with StarCloud to fly Outpost hardware for military edge compute

AWS will launch its Outpost on-premises server blades on StarCloud 2 to provide local EC2 instances for military customers, validating the orbital edge computing model and creating a revenue path before Starship-scale deployment.

"We're also partnering with AWS on launching the Outpost hardware. That's their on- premises server blade that they give to customers to run a local instance of VC2 and that will b…"

23:43

$RKLB

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Rocket Lab

LOWphilip johnston·Y Combinator·6 days ago

Rocket Lab Neutron rocket adding to launch capacity for space infrastructure

Neutron rocket from Rocket Lab is one of several new launch vehicles (alongside Starship, New Glenn, Nova) that will increase launch capacity and competition, supporting the space data center supply chain.

"There's also a whole bunch of other launch vehicles coming online. Stoke space has the Nova rocket. Um Rocket Lab has Neutron. Blue Glen uh Blue Origin has new Glenn."

20:06

$BENCHMARK

Benchmark

HIGHphilip johnston·Y Combinator·6 days ago

Benchmark leads $170M Series A in StarCloud, first space investment

Benchmark partner Chetan Puttagunta invested despite SpaceX conflict and skepticism about space compute feasibility, betting on StarCloud's elite engineering team (half from SpaceX, half from hyperscalers) to solve thermal and radiation challenges. The round came together after deep technical diligence on the team.

"I think basically he saw a really really strong technical team doing something that if it worked could be incredible... he spent a lot of time with the team. He spent a lot of tim…"

25:48

$STARCLOUD

StarCloud

HIGHphilip johnston·Y Combinator·6 days ago· position

StarCloud building orbital data centers to bypass terrestrial energy constraints

StarCloud is building data centers in space to access unlimited solar energy and avoid terrestrial power/regulatory bottlenecks for AI compute. They've launched StarCloud 1 with H100 GPUs, plan StarCloud 3 (200kW, 3-ton) with 88,000 satellite constellation for 20+ GW capacity, and have raised $170M led by Benchmark.

"So we are very quickly running up on constraints on where we can build new energy projects terrestrially. And so by building them in space, we get access to this almost unlimited…"

1:08

$NVDA

···

Nvidia

HIGHphilip johnston·Y Combinator·6 days ago

Nvidia co-developing radiation-hardened 'Reuben' space GPU with StarCloud

Nvidia is working closely with StarCloud on a custom space-grade chip (Reuben) after StarCloud successfully operated H100/H200/B200 GPUs in orbit. StarCloud's radiation testing data at Brookhaven and Knoxville cyclotron is unique and valuable to Nvidia for space-hardened designs. Jensen Huang featured StarCloud separation video at GTC keynote.

"We recently announced this uh Reuben space Reuben one chip that we're working with them on. Uh so that's designed for the space environment. We very heavily modified the H100 to m…"

21:32