Explore Astronomy

Astronomy Picture of the Day

The Solar System

Solar Eclipse.
The Eclipsed Sun by Robin Scagell
Copyright Robin Scagell: for permission to use contact him at Galaxypix@compuserve.com

General Information

Planet Image Diameter Mass Density Average distance from Sun(a.u.) Period of rotation No. of Satellites
Mercury Mercury 4878 km 3.3x1023 kg 5.43 g/cm3 0.387 58.6 days 0
Venus Venus 12104 km 4.9x1024 kg 5.24 g/cm3 0.723 -243.0 days* 0
Earth Earth 6378.14 km 6.0x1024 kg 5.52 g/cm3 1 1.0 days 1
Mars Mars 6787 km 6.4x1023 kg 3.94 g/cm3 1.524 1.026 days 2
Jupiter Jupiter 142,800 km 1.9x1027 kg 1.33 g/cm3 5.7 9.8 hours 63
Saturn Saturn 120,660 km 5.7x1026 kg 0.70 g/cm3 9.5 10.2 hours 59
Uranus Uranus 51,118 km 8.7x1025 kg 1.3 g/cm3 19.18 17.9 hours 27
Neptune Neptune 49,528 km 1.0x1026 kg 1.76 g/cm3 30.06 19.1 hours 13
Pluto (dwarf planet) Pluto 2300 km 1.5x1022 kg Between 1.92 and 2.06 g/cm Min 29.66 Max 39.53 -6.4 days 3

* '-' denotes retrograde motion