the solar system
Mercury
Size 0.38 Earths
Diameter 4880 kilometers
Mass 3.3011 × 1023 kg (0.055 Earths)
Aphelion (Point farthest away from the Sun) 0.466 Astronomical Units (1 AU = distance from Earth to the Sun)
Perihelion (Point closest to the Sun) 0.3 Astronomical Units
Gravity 0.38 times Earth’s gravity
Orbital Period (1 Mercurial Year) 88 Earth days
Rotational Period (1 Mercurial Day) 58.7 Earth days
Surface Temperature 100 K to 700 K (−173 °C to 427 °C)
Atmosphere’s composition 42% oxygen 29.0% sodium 22.0% hydrogen 6.0% helium 0.5% potassium Small amounts of other elements