Science & Space

Community-curated GitHub list of space APIs, trackers, datasets and visualization tools.

A new astronomy image with an expert caption every single day since 1995, and the full archive is browsable.

The open preprint server where most physics, math and astronomy research appears first.

Genuinely excellent long-form journalism on math, physics and biology, funded by the Simons Foundation.

Photograph any plant or animal and get it identified by a community plus AI, feeding real biodiversity research.

Free browser planetarium showing the sky exactly as it looks from your location right now.

Interactive 3D visualizations letting you fly through the solar system and follow active missions.

Cornell's global bird observation database with range maps, hotspots and live sighting feeds.

The best interactive periodic table, with properties, isotopes, orbitals and compound data layered on.

Precise pass predictions for the ISS, Starlink trains and visible satellites from wherever you are.

Real-time International Space Station tracking with pass notifications and orbital data.

The oldest and most trusted public source of orbital element sets and satellite catalog data.

Browse near-real-time satellite imagery of the whole Earth, useful for fires, storms and ice.

An open, aggregated page for every known species on Earth, pulling from museums and research institutions.

Live solar activity, aurora forecasts and geomagnetic storm alerts in plain language.

Overlays sky brightness on a world map so you can find genuinely dark skies near you.