Coprates Chasma

Valles Marineris · on Mars, 13.40° S, 61.40° W

The floor of the Solar System's largest canyon system, long enough to cross the United States and up to 7 km deep.

Stand at Coprates Chasma in Stellingo: the ground is shaped from orbiter elevation maps and photos, the hardware is placed where it really is, and the sky above — the Sun, the Earth, the stars — is the real one, at any date you choose.