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Open up this picture fully. Then look at the surface of Mars. Then look up to the top right. Spot Mars' moon Phobos high in the sky. Then notice the bright spot beside Phobos. That's Earth.

This image (a composite of five short and 12 long exposures) was taken by NASA's Curiosity rover on 5 September 2024. In the foreground is part of Mount Sharp, the central mountain in Gale Crater. Phobos orbits Mars at an altitude of about 6,000 km; at the time, Earth was 98.7 million km away.