The Oldest Rocks

The Blue Marble.

January 7 is Old Rock Day, so to celebrate let's take a look at some of the oldest rocks that we know altogether: the planets in our solar system. These are a few basic facts that would be found useful, and while I'm sure that you've looked these up at some time or another, it's a good place to keep all of them together so that in one quick look you can find out something.

I've recorded as much information as I could find pressed for time.

Mercury
Highest Temperature (0N/85N): 426.85/106.85 Celsius (800.33/224.33 Fahrenheit)
Lowest Temperature: -173.15/-193.15 Celsius (343.67/379.67 Fahrenheit)
Average Temperature: 66.85/-73.15 Celsius (152.33/-99.67 Fahrenheit)
Year (in Earth days): 88 days

Venus

Average Temperature: 462 Celsius (863.6 Fahrenheit)
Year (in Earth days): 224.7 days


Earth

Highest Temperature: 57.8 Celsius (136.04 Fahrenheit)
Lowest Temperature: -89.2 Celsius (-128.56 Fahrenheit)
Average Temperature: 14 Celsius (57.2 Fahrenheit)
Year (in Earth days): 365 days


Mars

Highest Temperature: 35 Celsius (95 Fahrenheit)
Lowest Temperature: -143 Celsius (-225.4 Fahrenheit)
Average Temperature: -63 Celsius (-81.4 Fahrenheit)
Year (in Earth days): 687 days


Jupiter

Average Temperature (1 bar level): -108.15 Celsius (-162.67 Fahrenheit)
Average Temperature (0.1 bar): -161.15 Celsius (-258.07 Fahrenheit)
Year (in Earth days): 4,332.59 days


Saturn

Average Temperature (1 bar level): -139.15 Celsius (-218.47 Fahrenheit)
Average Temperature (0.1 bar): -189.15 Celsius (-308.47 Fahrenheit)
Year (in Earth days): 10,759 days


Uranus

Highest Temperature: -216.15 Celsius (-357.07 Fahrenheit)
Lowest Temperature: -224.15 Celsius (-371.47 Fahrenheit)
Average Temperature: -220.15 Celsius (-364.27 Fahrenheit)
Year (in Earth days): 30,799 days


Neptune

Average Temperature (1 bar level): -201.15 Celsius (-330.07 Fahrenheit)
Average Temperature (0.1 bar): -218.15 Celsius (-360.67 Fahrenheit)
Year (in Earth days): 60,190 days