A Scale Perspective on Human Space Exploration

How Far Have
We Really Traveled?

The cosmos is almost incomprehensibly vast. Even after Artemis II's record-breaking flight, our nearest neighbor reveals how little of the void we have crossed.

// Both size and distance rendered to the same scale. Each pixel = ~1,200 km.

384,400 km · 30 Earth diameters · 1.3 light-seconds EARTH ø 12,742 km MOON ø 3,474 km ISS orbit 408 km altitude (barely visible at this scale)
Earth diameter
12,742 km
Moon diameter
3,474 km
Earth–Moon distance (avg)
384,400 km
≈ 30 Earths placed side by side · 1.3 light-seconds
EARTH ISS ORBIT 408 km · 90 min/orbit MOON FAR-SIDE FLYBY 7,600 km ARTEMIS II — FREE-RETURN TRAJECTORY OUTBOUND 4 DAYS · LUNAR FLYBY · RETURN 4 DAYS · NO ORBIT INSERTION outbound return ORBITS EXAGGERATED FOR CLARITY · POSITIONS NOT TO SCALE IN THIS VIEW
ISS Orbit (408 km altitude)
Artemis II free-return trajectory (solid = outbound, dashed = return)
International Space Station

Orbiting at just 408 km above Earth's surface, the ISS completes a full orbit every 90 minutes. At true scale, its orbit would be nearly invisible — a thin ring just 3.2% above Earth's radius. It represents the outer limit of permanent human presence in space since 2000.

Artemis II — April 1–10, 2026

NASA's Artemis II carried four astronauts on a free-return trajectory — a single smooth loop that swung ~7,600 km past the Moon's far side. Gravity did the work: no engine burn was needed to bring Orion home. The first crewed lunar flyby since Apollo 17 in 1972, the crew didn't orbit or land — just a sweeping arc around the far side and back. In doing so they broke the 56-year-old Apollo 13 record for the furthest humans have ever travelled from Earth, returning safely on April 10, 2026.