Founder @PathbreakerVC | Robots, spacecraft, reactors & other hard things like @K2SpaceCo @AntaresNuclear @GrayMatterRobot @SimbeRobotics @Frameworkputer
San Francisco, CA
Joined July 2009
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Ryan Gembala retweeted
We just fired our hall thruster at 20kW on orbit. That's 4 times more power than any Hall thruster system previously flown.
Rafael Martinez and the team have worked miracles over the last few years, and they're just getting started. Check out below for a preview of what's to come.
With a 20.6kW burn, we just shattered the record for highest Hall thruster burn ever completed on orbit – four times more powerful than any thruster that has ever flown in space.
And that’s just the beginning. We’re continuing to test and refine our in-house, custom-designed avionics and propulsion systems for next year’s launches. Below, our gimbal moves our thruster while it fires in our vacuum chamber. Of course, we couldn’t resist the opportunity to draw our Dyson sphere logo, which represents the abundant space future that we’re aiming for as we push the bounds of what’s possible in space.
Ryan Gembala retweeted
With a 20.6kW burn, we just shattered the record for highest Hall thruster burn ever completed on orbit – four times more powerful than any thruster that has ever flown in space.
And that’s just the beginning. We’re continuing to test and refine our in-house, custom-designed avionics and propulsion systems for next year’s launches. Below, our gimbal moves our thruster while it fires in our vacuum chamber. Of course, we couldn’t resist the opportunity to draw our Dyson sphere logo, which represents the abundant space future that we’re aiming for as we push the bounds of what’s possible in space.
Ryan Gembala retweeted
First autonomous eIPP flights ✅
With @CABQ, Reliable completed our first autonomous flights under the @FAANews & @USDOT Advanced Air Mobility Pilot Program.
Our automated Cessna 208B successfully navigated complex Class C airspace at @ABQSunport!
reliable.co/pr/reliable-robo…
Ryan Gembala retweeted
NEWS 📣 Reliable has raised new capital and officially surpassed $1B in valuation.
📍We’re expanding: new offices in Seattle, WA & San Diego, CA.
We're moving fast to build certified autonomous flight systems that make aviation safer and more accessible
reliable.co/pr/reliable-robo…
Ryan Gembala retweeted
I’ve always said the nuclear power in space will be a much bigger market and move faster than most people think. Recently it’s started moving faster than even I thought.
We’re getting America underway on nuclear power in space and ushering in the era of a Nuclear NASA.
With the signing of an MOU with @ENERGY, we’re taking the next giant leap toward exploring the outer solar system and sending American astronauts to Mars. Fission power will help us travel farther, operate longer, and power more capable scientific instruments.
Ryan Gembala retweeted
“What’s new is an ecosystem that allowed a company like Antares to unlock private capital, to build nuclear hardware, and turn on a prototype in months, not years.”
Our chief nuclear officer, Dr. Rian Bahran, joined @AtlanticCouncil 's Nuclear Energy Policy Summit. See more:
Ryan Gembala retweeted
We're opening pre-orders for the 192GB Framework Desktop this Wednesday morning Pacific Time. This has AMD's new Ryzen AI Max+ Pro 495, an open-end x4 PCIe slot, a pre-installed Noctua fan, and an optional pre-built config with Fedora pre-loaded.
Ryan Gembala retweeted
Announcing: $161M Strategic Breakthrough with the U.S Space Force
In response to @WhiteHouse EO Ensuring Space Superiority, and the National Initiative for Space Nuclear Power, @AntaresNuclear has been awarded a first-of-a-kind Strategic Breakthrough award to advance space nuclear power to flight.
Ryan Gembala retweeted
IN THE SPOTLIGHT: Advanced nuclear takes center stage on Capitol Hill tomorrow. ⚛️
The CEOs of @AntaresNuclear, @ValarAtomics, and @AaloAtomics—whose test reactors achieved criticality through @ENERGY’s Reactor Pilot Program this summer—will testify before @housescience on advancing U.S. leadership in next-generation nuclear technology.
Learn more: science.house.gov/2026/9/ene…
Ryan Gembala retweeted
@AntaresNuclear is having a year:
- Selected for Air Force's ANPI Program
- First new reactor to criticality
- $470m Series C
- SpaceWERX STRATFI
- Selected for Army's Janus Program
“We are seeking not just reactors capable of turning on for a brief demonstration, but rather systems able to deliver power with high-capacity factors for years of operation."
army.mil/article/294891
Ryan Gembala retweeted
Sharing this publicly for the first time:
orbit.gengalactic.com
We're working to make access to orbit (and not just LEO) a lot more straightforward, for everyone.
Ryan Gembala retweeted
Reliable Robotics is growing fast. We're looking for engineers who are passionate about aviation safety and building the future of aviation.
reliable.co/careers
#hiring #aviationautonomy #UAS #AerospaceEngineering #WomenInEngineering #Engineering #Automation
Ryan Gembala retweeted
I'm excited to share this detailed update on our Gravitas mission -- from design, to mission timeline, to what's next as we continue to successfully operate our first large, high power satellite on orbit and prepare for more launches in 2027 and beyond.
Ryan Gembala retweeted
🤖 You might think it's SF robotics week, but it's not. 1,000+ robotics developers are flying in for #Actuate26 the week of August 17th and there are so many events!
You may not be able to get a ticket to Actuate, but here's a good list of events you can still check out:
Ryan Gembala retweeted
Our biggest round yet: @K2SpaceCo has raised a $500M Series D at a $6.8B post-money valuation. The round was led by @kleinerperkins and @ICONIQCapital, with participation from @CapitalG, @lightspeedvp, @AltimeterCap, @sparkcapital, Sands Capital, @ARKInvest, @TRowePrice, and other existing investors.
"Scaling” is probably the word I’ve used most often the past few months in conversations with our investors, customers, and employees when talking about what’s next for K2 Space in 2027 and beyond:
--We’re going to continue to scale up mass production, to deliver against the $1B + in contracts we’ve won to-date.
--We’re going to scale up the satellite itself, from the 20kW Mega to the 100kW class Giga. Its no longer just 100kW, but we’ll save that update for another day.
The capital from the Series D will turbocharge this scaling.
Thanks to everyone who has been on this journey with us for the last four years – let's keep building bigger.