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At a Glance

Celestial Size Comparison

Choose the celestial objects you’re curious about. See at a glance how their sizes and environments compare.

Mars6,779 km

Mercury4,878.8 km

Measurement	Mars	Mercury
Mean radius	≈ 3,389.5 km	≈ 2,439.4 km
Diameter	≈ 6,779 km	≈ 4,878.8 km
Spherical approximate volume	≈ 163,115,609,798.7 km3	≈ 60,804,772,477.2 km3
Mass	≈ 6.417E23 kg	≈ 3.301E23 kg
Mean density	≈ 3,934 kg/m³	≈ 5,429 kg/m³
Surface gravity	≈ 3.71 m/s²	≈ 3.7 m/s²
Escape velocity	≈ 5 km/s	≈ 4.3 km/s
Rotation period	≈ 24.623 h	≈ 1,407.6 h
Orbital period	≈ 686.98 d	≈ 87.969 d
Mean temperature	≈ 210 K (-63.1°C)	≈ 440 K (166.9°C)
Surface pressure	≈ 636 Pa	≈ 0 Pa
Orbital semi-major axis	≈ 227,943,822.4 km	≈ 57,909,226.5 km

Mean radius

Mars: ≈ 3,389.5 km
Mercury: ≈ 2,439.4 km

Diameter

Mars: ≈ 6,779 km
Mercury: ≈ 4,878.8 km

Spherical approximate volume

Mars: ≈ 163,115,609,798.7 km3
Mercury: ≈ 60,804,772,477.2 km3

Mass

Mars: ≈ 6.417E23 kg
Mercury: ≈ 3.301E23 kg

Mean density

Mars: ≈ 3,934 kg/m³
Mercury: ≈ 5,429 kg/m³

Surface gravity

Mars: ≈ 3.71 m/s²
Mercury: ≈ 3.7 m/s²

Escape velocity

Mars: ≈ 5 km/s
Mercury: ≈ 4.3 km/s

Rotation period

Mars: ≈ 24.623 h
Mercury: ≈ 1,407.6 h

Orbital period

Mars: ≈ 686.98 d
Mercury: ≈ 87.969 d

Mean temperature

Mars: ≈ 210 K (-63.1°C)
Mercury: ≈ 440 K (166.9°C)

Surface pressure

Mars: ≈ 636 Pa
Mercury: ≈ 0 Pa

Orbital semi-major axis

Mars: ≈ 227,943,822.4 km
Mercury: ≈ 57,909,226.5 km

Please Note

This comparison is based on the most reliable observational data available. Celestial information may change with new research and observations, so please treat it as a general guide rather than a definitive source.