You asked about Space Exploration
26 people built something like it. 6 are gone.
That is 23% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | Seamless mobility to, through, and from space. It starts with 100%… · stokespace.com | still up |
| 2021-06-01 | Moving Things Around in Space, Imaging Space Objects When We're Not · turionspace.com | still up |
| 2021-06-01 | YCEpsilon3 AI-Powered ERP, MES, and Test Software for Complex Operations · epsilon3.io | still up |
| 2021-06-01 | Orbital logistics: Unleashing space industry, from Earth to asteroids · transastra.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 |
| 2021-07-17 | zorbi.cards | moved |
| 2021-06-02 | mani.ai | unverified |
| 2021-06-01 | YCStownest Flexible On-Demand Storage Space for Household, SMEs & Travellers. · stownest.com | still up |
| 2021-01-01 | The lightest electric aircraft motors in the world. · h3x.tech | still up |
| 2021-01-01 | YCAlbedo Full-stack VLEO satellite missions · albedo.com | still up |
| 2021-01-01 | YCREGENT All-electric seagliders for fast, affordable regional transportation · regentcraft.com | still up |
| 2021-06-01 | Turning space into a transportation layer for Earth · inversionspace.com | still up |
| 2021-02-25 | movement.fm | gone~20mo |
| 2021-06-01 | YCDeskimo Workspaces on demand, paid by the minute. · deskimo.com | still up |
| 2021-06-01 | Vertical takeoff and landing aircraft for major airlines · odysaviation.com | still up |
| 2021-06-01 | AI-Driven Tech & Space Optimization to Scale Restaurants · onestopkitchen.com | gone |
| 2021-06-01 | Near Space Flying Machines · kalamlabs.in | still up |
| 2021-01-01 | We make satellites to image everywhere on Earth, every 15 minutes · albaorbital.com | still up |
| 2021-09-14 | peterlavigne.itch.io | still up |
| 2021-12-13 | sqlnotebook.com | still up |
| 2021-06-01 | YCCabal Private workspace for founders, investors, and advisors to collaborate · getcabal.com | still up |
| 2021-01-01 | YCRoutine AI-native all-in-one workspace for startups · routine.co | still up |
| 2021-08-06 | launch.orbital.chat | gone |
| 2021-12-22 | interviewer.space | gone |
| 2021-05-21 | vrland.io | moved |
| 2021-05-25 | dolohq.com | still up |
| 2021-01-13 | remnote.io | moved |
| 2021-01-02 | podots.com | gone~27mo |
| 2021-07-21 | rocketcrew.space | gone |
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.
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.