Planetary Statistics

Sizes are given in MILES and temperatures are given in DEGREES FAHRENHEIT. For the same table using KILOMETRES and DEGREES CELSIUS, click here.

NAME OF PLANET	DISTANCE FROM SUN (in Miles)	DIAMETER (in Miles)	TIME TO SPIN ON AXIS (a day)	TIME TO ORBIT SUN (a year)	GRAVITY (Earth = 1)	AVERAGE TEMPERATURE	CONTENTS OF ATMOSPHERE	YEAR OF DISCOVERY	MOONS
Mercury	36,000,000	3,031	59 days	88 days	0.38	-297°F to 800°F	Sodium, helium	n/a	None
Venus	67,000,000	7,521	243 days	224 days	0.9	896°F	Carbon Dioxide (96%), Nitrogen (3.5%)	n/a	None
Earth	92,960,000	7,926	23 hours, 56 mins	365.25 days	1	57°F	Nitrogen (77%), Oxygen (21%)	n/a	1
Mars	141,700,000	4,222	24 hours, 37 mins	687 days	0.38	-81°F	Carbon Dioxide(95.3%), Argon	n/a	2
Jupiter	483,500,000	88,846	9 hours, 55 mins	11.86 years	2.64	-202°F	Hydrogen, Helium	n/a	63
Saturn	888,750,000	74,900	10 hours, 39 mins	29 years	1.16	-202°F	Hydrogen, Helium	n/a	60
Uranus	1,740,200,000	31,763	17 hours, 14 mins	84 years	1.11	-328°F	Hydrogen, Helium, Methane	1781	27
Neptune	2,797,770,000	30,779	16 hours, 7 mins	164.8 years	1.21	-328°F	Hydrogen, Helium, Methane	1846	13

NAME OF DWARF PLANET	DISTANCE FROM SUN (in Miles)	DIAMETER (in Miles)	TIME TO SPIN ON AXIS (a day)	TIME TO ORBIT SUN (a year)	AVERAGE TEMPERATURE	YEAR OF DISCOVERY	KNOWN MOONS***
Ceres	257,031,000	950	9 hours, 5 minutes	4 years, 220 days	-158 °F	1801	None
Pluto	2,761,060,000 to 4,690,700,000	1,413	6 days, 9 hours	248 years	-373 °F	1930	3
Eris	3,518,000,000 to 9,088,000,000	1,489	8 hours	557 years	-386 to - 414°c	2005	1

DISTANCE FROM THE SUN: The distance from the Sun given in the above table is the average distance the planet is away from the Sun. The planets don't orbit in completely circular orbits but in most cases, the difference between the planet's closest distance from the Sun doesn't vary greatly from its furthest point. Where the orbits are more elliptical than circular (where the planet's closest distance from the Sun varies greatly from its furthest point) the range is given.

DIAMETER: The diameters of Jupiter and Saturn are wider across the equator (the values given in the table) than they are from their North to their South Poles. This is because of their fast rotational speeds which "squash" the planets.

TIME TO SPIN ON AXIS: This is the length of time it takes for the planet to complete one full rotation. This is measured in Earth time. For example, in the case of Mercury, it takes the planet 59 Earth days to spin on its axis.

TIME TO ORBIT SUN: This is the length of time it takes for the planet to complete one full journey around the Sun. This is measured in Earth time. For example, in the case of Mars, it takes the planet 687 Earth days to orbit the Sun.

GRAVITY: To work out your weight on another planet, multiply your weight by the number given in this column.

AVERAGE TEMPERATURE: The average temperatures for the rocky Inner Planets (Mercury. Venus, Earth and Mars) and the Dwarf Planets (Ceres, Pluto and Eris) are the temperatures at the surface. The average temperatures for the Gas and Ice Giants (Jupiter, Saturn, Uranus and Neptune) are the temperatures at the tops of the planets' clouds. These gas planets will be hotter towards their - possibly solid - cores, generating their own heat sources, giving off more heat than they actually receive from the Sun. Where there is a large difference between the maximum and the minimum temperature on a planet, the full temperature range is given.

CONTENTS OF ATMOSPHERE: Mercury and Pluto are too small to actually possess a "sky-like" atmosphere. The gases listed in the table by Mercury and Pluto are gases that surround the planets.

YEAR OF DISCOVERY: The planets Mercury to Saturn were observed thousands of years ago and therefore don't have a date of discovery since there is nobody credited with being the first person to spot them. Uranus was the first planet to be discovered. It may possibly have been seen before its official date of discovery, but it would not have been recognised as a planet.

KNOWN MOONS: Moons are constantly being discovered orbiting planets. The number of moons listed are the number confirmed when this page was updated (February 2007).