SIZE: 3,031 miles (4,878 km) diameter
DISTANCE FROM SUN: an average of 35,980,000 miles (57,900,000 km)
ATMOSPHERE COMPOSITION: Sodium, helium, hydrogen, and oxygen.
TEMPERATURE: -279 degrees Fahrenheit to 801 degrees Fahrenheit (-173 degrees Celsius to 427 degrees Celsius).
ONE DAY: 59 Earth days.
ONE YEAR: 88 Earth days.
NATURAL SATELLITES: none
DISTINCTIVE FEATURE: Closest planet to the sun, and the fastest planet around the sun.