Today's frame from the dark sky.

Satellite passes, ISS sightings, and visibility forecasts tailored to your location. The classic.

A friendly almanac of what's up tonight: planets, conjunctions, meteor showers, and observing tips.

NASA's live high-definition feed from cameras mounted outside the International Space Station.

Solar flares, geomagnetic storms, and aurora forecasts in near-real-time. Worth bookmarking.

NASA's official ISS pass predictor. Type your city, get a list of when the station will be visible overhead — bright, fast, and unmistakable.

Every upcoming rocket launch, with countdowns, mission details, and live stream links. Knowing one is going up tonight changes how you look at the sky.

Browser-based 3D tours of the solar system, exoplanets, and active spacecraft missions.

A procedural universe simulator. Travel anywhere — every star, every planet, to scale.

Astronomy data visualization from the AAS — guided tours and full-sky imagery in one viewer.

Beautiful, browser-friendly model of the solar system with realistic orbital motion.

Interactive sky atlas from CDS Strasbourg — multi-wavelength imagery and catalog overlays.

Free desktop planetarium from KDE. Detailed sky charts plus telescope and equipment control.

Every Astronomy Picture of the Day going back to June 16, 1995. Three decades of cosmic wonder, one image and one explanation per day. Bottomless rabbit hole.

High-precision ephemerides for solar system bodies. The serious tool, with a wonderfully retro interface.

Database of asteroid composition, mass, and orbital data — sortable by hypothetical mining value.

The canonical source for satellite orbital elements (TLEs). If it's in orbit, it's catalogued here.

A high-resolution interactive map of the lunar surface, with elevation, mission sites, and overlays.

The same idea, applied to Mars — rover landing sites, terrain, and hazards in a single viewer.