You asked about Space Exploration
12 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 |
|---|---|---|
| 2022-06-01 | YCQuindar Datadog for Space · quindar.space | still up |
| 2022-01-01 | We Mine Asteroids · astroforge.io | still up |
| 2022-06-01 | Applied AI for The Emerging Economies · latentspace.sh | still up |
| 2022-01-01 | First electric business aircraft designed for hydrogen propulsion · beyond-aero.com | still up |
| 2022-01-01 | Bluetooth to Space · hubble.com | still up |
| 2022-06-01 | We're building satellites to create a real-time 3D map of the world. · arraylabs.io | still up |
| 2022-01-01 | YCWyvern High-res hyperspectral pictures of Earth from space · wyvern.space | still up |
| 2022-01-01 | YCIMT Care Disrupting Indian Insurance space by empowering distrubutors · imt.care | still up |
| 2022-06-01 | Airplanes anyone can fly · airhartaero.com | still up |
| 2022-06-01 | YCVelontra Hypersonic space plane that can take-off from any location and weather · velontra.com | still up |
| 2022-06-01 | YCChordio Claude Code design workspace built for product teams · chordio.com | still up |
| 2022-06-01 | We make the world's most efficient aircraft · seaflight.tech | still up |
How this compares
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.