TRAPPIST-1
Seven Earth-size planets around a single star
TRAPPIST-1 launched on February 22, 2017 with 7 votes, #1,161 of 3,156 launches that month. The site was still online in September 2026, 9 years on.
What it does
NASA’s Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located
Does a similar job
all alternatives →



Planet Hunters2015 · zooniverse.org · ▲106Help astro-scientists search for life in our galaxy & beyond

More growth this month
the category →
wallhop is a free paywall bypass. Paste any article link to read it without paywall popups, ads or clutter. No signup, no extension. A simple 12ft.io alternative.
Growth · 17d ago · wallhop.io

Source: Product Hunt launch ↗
Launched alongside, February 2017
the whole month →
Lottie by Airbnb▲1,138Easily add high-quality animation to any native app
Dev tools · 2017 · airbnb.com
Web Gradients▲906Curated collection of 180 free fresh background gradients 🚀
Work · 2017 · webgradients.com




A free guide to all HTML elements and attributes.
Life & fun · 2017 · htmlreference.io