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Sizes


Mercury 4,879 km 57,909,227 km (0.39 AU) 88 days

Venus 12,104 km 108,209,475 km (0.73 AU) 225 days

Earth 12,742 km 149,598,262 km (1 AU) 365.26 days Mars 6,779 km 227,943,824 km (1.38 AU) 1.9 years

Jupiter 139,822 km 778,340,821 km (5.20 AU) 11.9 years

Saturn 116,464 km 1,426,666,422 km (9.58 AU) 29.5 years

Uranus 50,724 km 2,870,658,186 km (19.22 AU) 84.0 years

Neptune 49,244 km 4,498,396,441 km (30.10 AU) 164.8 years

Facts


How many planets are there in our solar system? 8

What is the smallest planet?
Mercury

What is the largest planet?
Jupiter

Which planet is closest to the Sun?
Mercury

Which planet is farthest from the Sun?
Neptune

What is the coldest planet?
On average Neptune is the coldest planet

What is the hottest planet?
Venus

What are the inner planets?
Mercury, Venus, Earth and Mars

What are the outer planets?
Jupiter, Saturn, Uranus and Neptune

what is a planet?


What Is A Planet? Planets are among the many worlds and smaller objects that orbit the Sun. The formal definition of planet, as voted on by the International Astronomical Union in 2006, is as follows: A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.
Under this definition, Pluto is NOT a planet, but has been deemed a dwarf planet because it has not yet cleared its orbit. This definition is under discussion, particularly by members of the planetary science community, and it may yet be further refined.