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• 1 2016-04-05T10:08:08+00:00 Planetary Facts 11 image_header 2021-01-11T18:55:51+00:00 Arranging the planets in order from the planet closest to the sun to the one furthest to the sun, we have Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
  
  The table below list a number of planetary facts for each planet.  (If you are a detail-oriented person and would like to know more facts to, say win trivia games or impress friends at parties, please go and visit this planetary fact sheets site.)   The table is a compilation that in some cases lists actual values, while other parameters are presented as a comparison to Earth (wherever you see the Earth value = 1), and some are presented both ways.  For example, we give the diameter of planets in km and compared to Earth’s diameter.  The reasons are twofold: 1) As Earthlings we have a very Earth-centric view and it is easier to relate many planetary comparisons to earthly existence.  2) Many numbers are so large in absolute values that we can’t really relate to them. That is the reason we neglect to tell you that the mass of Jupiter is 1898x10²⁴ kg.  For more information on the individual planets, click on the planet name; for definitions of individual parameters, click on those.  You may be surprised to find our moon on this table; it is often included in traditional planetary comparisons.  Everyone's favorite dwarf planet, Pluto is also included.
  
  As we discuss aspects of the different planets, it will be helpful for you to come back to this table for reference.

  
  Planetary Facts - Just the facts (Ratio to Earth Values) Link to site found here

   

  	MERCURY	VENUS	EARTH	MOON	MARS	JUPITER	SATURN	URANUS	NEPTUNE	PLUTO
  Mass	0.0553	0.815	1	0.0123	0.107	317.8	95.2	14.5	17.1	0.0025
  Diameter	0.383	0.949	1	0.2724	0.532	11.21	9.45	4.01	3.88	0.186
  Diameter (km)	4879	12,104	12,756	3475	6792	142,984	120,536	51,118	49,528	2370
  Density	0.984	0.951	1	0.605	0.713	0.24	0.125	0.23	0.297	0.38
  Density (kg/m3)	5427	5243	5514	3340	3933	1326	687	1271	1638	2095
  Gravity	0.378	0.907	1	0.166	0.377	2.36	0.916	0.889	1.12	0.071
  Gravity (m/s2)	3.7	8.9	9.8	1.6	3.7	23.1	9	8.7	11	0.7
  Rotation Period	58.8	-244	1	27.4	1.03	0.415	0.445	-0.72	0.673	6.41
  Rotation Period (hours)	1407.6	-5832.5	23.9	655.7	24.6	9.9	10.7	-17.2	16.1	-153.3
  Length of Day	175.9	116.8	1	29.5	1.03	0.414	0.444	0.718	0.671	6.39
  Length of Day (hours)	4222.6	2802	24	708.7	24.7	9.9	10.7	17.2	16.1	153.3
  Distance from Sun	0.387	0.723	1	0.00257*	1.52	5.2	9.58	19.2	30.05	39.48
  Distance from Sun (106 km)	57.9	108.2	149.6	0.384*	227.9	778.6	1433.5	2872.5	4495.1	5906.4
  Orbital Period (days)	88	224.7	365.2	27.3	687	4331	10,747	30,589	59,800	90,560
  Mean Temperature (C)	167	464	15	-20	-65	-110	-140	-195	-200	-225
  Surface Pressure (bars)	0	92	1	0	0.01	Unknown*	Unknown*	Unknown*	Unknown*	0
  Number of Moons	0	0	1	0	2	79	62	27	14	5
  Ring System?	No	No	No	No	No	Yes	Yes	Yes	Yes	No
  Global Magnetic Field?	Yes	No	Yes	No	No	Yes	Yes	Yes	Yes	Unknown

  
  
  Update June 2018: Until a few days ago, the correct answer for the number of moons of Jupiter would have been 67, but then..

  A dozen new moons of Jupiter discovered, including one 'oddball'

  Returning to our survey and examining the planetary fact sheet we find that we can subdivide our planets nicely into 2 categories: