Size Duel deck / Space
Mercury
Mass: mass
3.3 × 10²³ kg
Smaller than Ganymede, yet about twice its mass: it is mostly iron and rock.
Sources and checks
Checked 2026-10-19: Claude (AI build agent): Wikidata statement compared, second-source quote verified in the fetched page. Quotes are short passages from each source.
Wikidata P2067: 330 yottagramQ308, CC0, retrieved 2026-10-19
“Mass (10 24 kg) 0.33010”NASA NSSDCA planetary fact sheet: source, retrieved 2026-10-19
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