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Solar system planets quiz
Enter the planets names in the box (not moons).
Last updated: December 11, 2016
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May 5, 2014
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It is the densest planet in the Solar System.
This planet has an axial tilt that is almost zero (meaning it has no distinguishable seasons).
This planet has the larger satellite of the solar system (with a diameter greater than that of the planet Mercury).
It is the site of Olympus Mons, the second highest known mountain within the Solar System (the tallest on a planet).
It has a mass of 317.8 Earths and has the shortest day of all the planets.
It is the only planet of the Solar System that is less dense than water (about 30% less).
After the Moon, it's the brightest natural object in the Earth night sky.
It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System.
Comet Shoemaker–Levy 9 was a comet that broke apart and collided with this planet, providing the first direct observation of an extraterrestrial collision of Solar System objects.
The gravitational interaction of this planet with its moon is gradually slowing the planet's rotation and pulling them apart.
Its axis of rotation is tilted sideways, nearly into the plane of its revolution about the Sun (meaning that it's rolling around the sun instead of spinning around the sun like the other planets).
This planet has a very weak magnetic field. This surprised scientists, who expected it to have a magnetic field similar in strength to Earth's.
It has two moons, Phobos and Deimos, which are very small and irregularly shaped. Phobos is expected to collide with this planet in the far future.
This planet revolves around the Sun once every 84 Earth years.
It was the first planet found by mathematical prediction rather than by empirical observation.
A persisting hexagonal vortex in the atmosphere around the north pole was first noted in the Voyager images of this planet.
A year in this planet is just 88 Earth days long. Also it's the most cratered planet in the Solar System.
Is by far the hottest planet in the Solar System.
This planet has a powerful magnetic field caused by the nickel-iron core of the planet, coupled with its rapid rotation.
It has a rotation period of 17h 14min and is the coldest planet in the solar system.
The atmospheric pressure at the planet's surface is 92 times that of Earth's.
It is currently host to five functioning spacecrafts (as of 2014).
Its largest moon, Titan, is larger than the planet Mercury and is the only moon in the Solar System to retain a substantial atmosphere.
Among the gaseous planets in the solar system, it is the most dense.
Its characteristic surface color is caused by iron oxide, more commonly known as hematite, or rust.
It has the strongest winds of any planet in the Solar System, with recorded wind speeds as high as 2,100 kilometres per hour (1,300 mph).
This planet is 5.5% of Earth's mass and has no moons.
The fifth largest planet in the Solar System.
The possible presence of underground water oceans on two of its moons has led to speculation that life could be possible there (in Europa and Ganymede).
In this planet a day lasts longer than a year (243 versus 224.7 Earth days).
The average distance between this planet and the Sun is over 1.4 billion kilometres (9 times the Sun-Earth distance or 9 Astronomical Units).
It is the only planet, other than the Earth, that has polar ice caps.
This planet has the most extreme temperature change between day and night.
Its moon, Triton, is the only large moon in the Solar System with a retrograde orbit, which is an orbit in the opposite direction to its planet's rotation.
It is the second least dense planet in the Solar System, after Saturn.
Even though this planet is called a gas giant, scientists believe it has a solid core.
Albert Einstein's General Theory of Relativity finally provided the explanation for the anomalous precession observed on this planet.
It is the only planet that has a center of mass with the sun that lies outside the sun itself.
The gravity on this planet is the second largest of any planet in the Solar System, behind only Jupiter.
This planet is home to millions of species of life and gradually one of them is extinguishing all the others.
Jun 15, 2014
Good quiz. Makes you think. 40/40 with 6:57 left
Jun 19, 2014
Thanks. Glad You enjoy it!
Feb 17, 2015
It is kinda easy to get 100% since there are only 8 possible answers..
Oct 17, 2015
I like this quiz. If you like solar system facts try this one too:
May 8, 2016
Maybe you should let others know that some answers will be repeated.
Jan 6, 2019
quite obvious since there are 40 questions and only 8 planets..
Jun 6, 2016
several planets have near-zero axial tilts: Mercury, Venus, Jupiter.
Jun 6, 2016
Also, any of the gas giants might (probably) have a solid core.
Oct 18, 2016
Good quiz...done with 10 min on the clock...
Aug 5, 2017
I really enjoyed the quiz. However, probably like some of the others I believe the time should be shortened - I finished in three minutes, so maybe a reasonable limit would be five or six (I know my stuff :D )
Jan 6, 2019
I have 6 min left, knew about half, quarter was an educated guess (like which is the biggest planet, well not one of the first four) and like 10 of them pretty much a complete guess.
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