You asked about Space Exploration
146 people built something like it. 0 are gone.
That is 0% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2016-01-01 | Building humanity’s multiplanetary future. · relativityspace.com | still up |
| 2016-01-01 | YCAstranis Advanced satellites for high orbits. · astranis.com | still up |
| 2021-01-01 | Seamless mobility to, through, and from space. It starts with 100%… · stokespace.com | still up |
| 2022-06-01 | YCQuindar Datadog for Space · quindar.space | still up |
| 2021-06-01 | Moving Things Around in Space, Imaging Space Objects When We're Not · turionspace.com | still up |
| 2019-06-01 | Last-mile delivery for satellites. · epic-aerospace.com | still up |
| 2021-06-01 | YCEpsilon3 AI-Powered ERP, MES, and Test Software for Complex Operations · epsilon3.io | still up |
| 2022-01-01 | We Mine Asteroids · astroforge.io | still up |
| 2021-06-01 | Orbital logistics: Unleashing space industry, from Earth to asteroids · transastra.com | still up |
| 2017-06-01 | Tesseract builds better thrusters for modern satellites · tesseract.space | still up |
| 2025-01-01 | Building lunar landers · instinct-space.com | still up |
| 2026-06-01 | YCPacific Mass-producing and financing micro data center incredibly quickly. · gopacific.ai | still up |
| 2026-09-01 | AI spacecraft operators that lives onboard the vehicle · orcaaerospace.com | still up |
| 2021-06-01 | We visually monitor space objects for governments and defense · heo-robotics.com | still up |
| 2021-01-01 | The highest-accuracy global weather data from low-cost flat satellites · careweather.com | still up |
| 2026-06-01 | YCExosat Building a neutral, sovereign alternative to Starlink · exosat.com | still up |
| 2024-06-01 | In-Space Refueling · spaceium.com | still up |
| 2022-12-20 | obsidian.md | still up |
| 2022-07-06 | outverse.com | still up |
| 2024-01-01 | YCLegora The AI workspace for lawyers · legora.com | still up |
| 2022-07-26 | dock.us | still up |
| 2022-05-25 | wannabe-entrepreneur.com | still up |
| 2022-02-15 | miro.com | still up |
| 2016-01-01 | YCBoom Economically and environmentally sustainable supersonic travel · boomsupersonic.com | still up |
| 2022-04-06 | tandem.chat | still up |
| 2022-02-16 | app.kickscale.com | still up |
| 2023-05-21 | badgers.space | still up |
| 2022-06-28 | notionlytics.com | still up |
| 2022-10-18 | warmly.ai | still up |
| 2022-03-16 | notionv5.vyshnav.xyz | still up |
| 2022-10-26 | flat.social | still up |
| 2022-02-25 | popspace.io | still up |
| 2022-04-29 | basewell.com | still up |
| 2022-03-08 | stylespace.com | still up |
| 2022-05-12 | flowjin.com | still up |
| 2022-10-18 | tixio.io | still up |
| 2022-04-03 | mmm.page | still up |
| 2022-07-07 | spacesdown.com | still up |
| 2022-05-07 | cowello.com | still up |
| 2022-10-06 | payloadspace.com | still up |
| 2022-06-01 | Applied AI for The Emerging Economies · latentspace.sh | still up |
| 2022-11-19 | meat.io | still up |
| 2021-06-01 | YCStownest Flexible On-Demand Storage Space for Household, SMEs & Travellers. · stownest.com | still up |
| 2022-01-01 | First electric business aircraft designed for hydrogen propulsion · beyond-aero.com | still up |
| 2024-01-01 | YCModel ML AI Workspace for Financial Services. · modelml.com | still up |
| 2017-06-01 | YCPyka Autonomous electric airplanes · flypyka.com | still up |
| 2021-01-01 | The lightest electric aircraft motors in the world. · h3x.tech | still up |
| 2023-07-09 | samueltate.com | still up |
| 2021-01-01 | YCAlbedo Full-stack VLEO satellite missions · albedo.com | still up |
| 2024-01-01 | Supersonics for the new Jet Age · astromecha.co | still up |
| 2025-09-01 | YCIcarus Stratospheric birds for defense · icarus.one | still up |
| 2022-01-01 | Bluetooth to Space · hubble.com | still up |
| 2019-01-01 | Heart makes electric airplanes with an all-electric range of 250 miles · heartaerospace.com | still up |
| 2022-03-10 | prepform.com | still up |
| 2017-06-01 | The operating system powering ecommerce fulfillment · flow.space | still up |
| 2023-11-28 | spaceflight-news.jerrynsh.com | still up |
| 2023-11-07 | play.spacelancers.com | still up |
| 2021-01-01 | YCREGENT All-electric seagliders for fast, affordable regional transportation · regentcraft.com | still up |
| 2023-06-01 | YCHyLight Unmanned airships for inspecting our critical assets · hylight.aero | still up |
| 2022-11-29 | blog.spacehey.com | still up |
How this compares
Y Combinator reports its own outcomes, including acquisitions. The other two are judged by asking the domain, so they are not measured the same way and are never averaged together.
Older launches have had longer to die, so this slope is expected. A year that broke it would mean something is wrong with the checking.
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.