Planets questions This is a list of recently added questions about planets. Mars colonisation is a hype topic. What is the biggest threat for those wishing to take a part in a journey to Mars?Cosmic rays. The only efficient protection against high energetic cosmic radiation, one we are granted with, is Earth magnetic field. Both during a long flight to Mars and through the stay on the planet, that did not form electromagnetic field, astronauts would be exposed to ionization. Created by: smyruhard 46% low temperatureslow temperatures1172lack of oxygenlack of oxygen3285poor gravitypoor gravity926cosmic rayscosmic rays4763astronautics riddles » Which planet of the solar system has the smallest surface?Mercury has a surface of 75x10^6 km^2, which is equal to 14,7% of Earth' surface.Created by: lanusienkaeasy 77% MercuryMercury2529VenusVenus305EarthEarth144MarsMars274space riddles » How many times is Jupiter's volume larger than Earth's volume?1,321 times. Jupiter is so big, that it is almost the size of a star. The smallest known red dwarf is just 16 percent larger in diameter than Jupiter.Created by: K.R.A.C.hard 56% 800 times800 times9081,321 times1,321 times286150 times50 times45710,000 times10,000 times854Solar System riddles » How many planets does the Solar System consist of?Eight. These are Mercury, the Venus, the Earth, Mars, the Jupiter, the Saturn, the Uranus and the Neptune. The Pluto is excluded from the list since 2006, and it is classified as one of dwarf planets (not even the largest of them).Created by: Paweł Kołodziejczykeasy 72% sevenseven607eighteight4175ninenine838173173109astronomy riddles » How many planets in the Solar System are not named after a Greek or Roman god?One. It's the Earth.Created by: globalquiz.orgaverage 61% nonenone1302oneone4861twotwo1033threethree733names riddles » Which planets in the Solar System have no natural satellites?Mercury and Venus. Only Mercury and Venus have no natural satellites.Created by: globalquiz.orghard 55% Mercury onlyMercury only1819Mercury and VenusMercury and Venus5216Mercusy and MarsMercusy and Mars1038there are no such planetsthere are no such planets1265astronomy riddles » Which planet is the brightest seen from Earth?Venus is much brighter than other planets. It is due to its proximity to the Sun (source of light), and bright clouds of sulfuric acid in its atmosphere.Created by: globalquiz.orgaverage 68% MercuryMercury1367VenusVenus9833MarsMars1489JupiterJupiter1692technology riddles » This is the aurora of Jupiter. What are the visible bright spots caused by?Jupiter moons. Jupiter's moons, especially Io (spot on the left), are powerful sources of auroras on Jupiter. These arise from electric currents along field lines, generated by a dynamo mechanism due to the relative motion between the rotating planet and the moving moon.Created by: globalquiz.orghard 42% volcanic peaksvolcanic peaks444atmospheric stormsatmospheric storms2497Jupiter moonsJupiter moons4508multiple magnetic poles of Jupitermultiple magnetic poles of Jupiter3177physics riddles » Which planet is the closest in size to Earth?Venus. The equatorial diameter of Venus is about 95% the size of the Earth's equatorial diameter. Moreover, its mass, density and orbit is also closest to those of Earth.Created by: Kasiahard 54% MercuryMercury974VenusVenus6242MarsMars3586UranusUranus607technology riddles » Play Solar System quiz and see all the questions.