10 most difficult Solar System riddles A list of ten (out of 45) Solar System related questions that are the most often answered incorrectly Solar System quiz What is the temperature of the center of the Sun?16 million degrees Celsius. The surface temperature is only 5500 degrees Celsius.very hard 19% 16 thousand degrees Celsius16 thousand degrees Celsius21%16 million degrees Celsius16 million degrees Celsius19%16 billion degrees Celsius16 billion degrees Celsius36%16 trillion degrees Celsius16 trillion degrees Celsius22%Created by: Tschuka . Statistics based on 421 answers in 3 languages »temperatures riddles » What is the diameter of the Milky Way?100 000 thousand light years. The diameter of our galaxy - the Milky Way is 100,000 light years. The Sun is located about 26,000 light years from its center.very hard 19% 100 000 thousand light years100 000 thousand light years19%200 000 thousand light years200 000 thousand light years26%500 000 thousand light years500 000 thousand light years32%1 000 000 thousand light years1 000 000 thousand light years21%Created by: Tschuka . Statistics based on 429 answers in 2 languages »numbers riddles » What is the second brightest star in the night time sky, after Sirius?Canopus is the brightest star in the southern constellation of Carina, and the second brightest star in the night time sky, after Sirius. Its name is generally considered to originate from the mythological Canopus, who was a navigator for Menelaus, king of Sparta.very hard 20% ArcturusArcturus6%CanopusCanopus20%VegaVega62%ProcyonProcyon11%Created by: Ninjai. Statistics based on 45 answers in 2 languages »stars riddles » Which of Saturn's natural satellites has such distinctive equatorial ridge?Iapetus. The ridge is 13 km high, 20 km wide and 1300 km long. Its origin is not known, but considering the amounts of craters it's safe to assume that this is a very old geological creation.very hard 24% DioneDione12%RheaRhea29%EnceladusEnceladus33%IapetusIapetus24%Created by: Ninjai. Statistics based on 2338 answers in 2 languages »planets riddles » In which phase is the Moon during the solar eclipse?New moon. The new moon is the first phase of the Moon, when its orbit is not seen from the Earth; it is at this moment when the Moon and the Sun have the same ecliptical longitude. The Moon is not visible at this time except when it is seen in silhouette during a solar eclipse when it is illuminated by earthshine.very hard 27% first or third quarterfirst or third quarter8%it doesn't matterit doesn't matter25%full moonfull moon39%new moonnew moon27%Created by: Ninjai. Statistics based on 2891 answers in 2 languages »Moon riddles » The largest impact crater of the Solar System is:Caloris Planitia is a plain within a large impact basin on Mercury, informally named Caloris, about 1,550 km in diameter. It is one of the largest impact basins in the Solar System. The crater, discovered in 1974, is surrounded by a ring of mountains approximately 2 km (1.2 mi) tall. very hard 28% Valles MarinerisValles Marineris32%CalorisCaloris28%Rupos AltaiRupos Altai22%AristarchusAristarchus17%Created by: Tschuka . Statistics based on 1439 answers in 2 languages »space riddles » Who first described the heliocentric model of the Sun and planets? ( with the Sun in the center)Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it. He was also the first one to deduce the rotation of earth on its axis. His astronomical ideas were often rejected in favor of the incorrect geocentric theories of Aristotle and Ptolemy. Nicolaus Copernicus attributed the heliocentric theory to Aristarchus.very hard 29% Nicolaus CopernicusNicolaus Copernicus49%Claudius PtolemyClaudius Ptolemy18%Aristarchus of SamosAristarchus of Samos29%Isaak NewtonIsaak Newton3%Created by: Tschuka . Statistics based on 3603 answers in 2 languages »astronomy riddles » Where are the craters of Dostoyevsky, Chopin and Van Gogh?On Mercury. Discovered craters on Mercury are named after outstanding artists. In addition to the above, there are also craters on the Mercury map named after: A. Mickiewicz, L. van Beethoven, F. Goya and C. Monet.very hard 29% On MercuryOn Mercury29%On MarsOn Mars37%On UranusOn Uranus8%There are no such cratersThere are no such craters24%Created by: Tschuka . Statistics based on 3410 answers in 2 languages »astronomy riddles » Who invented spectroscope?Joseph van Fraunhofer. Joseph Ritter von Fraunhofer was a Bavarian physicist and optical lens manufacturer. He made optical glass and achromatic telescope objective lenses, invented the spectroscope, and developed diffraction grating. very hard 30% Issac NewtonIssac Newton18%William HerschelWilliam Herschel23%Joseph van FraunhoferJoseph van Fraunhofer30%Edwin HubbleEdwin Hubble27%Created by: Ninjai. Statistics based on 6072 answers in 3 languages »inventors riddles » When was the the invisible side of the Moon photographed for the first time?In 1959, the Soviet Luna spacecraft photographed the invisible side of the Moon, proving that the dark patches on the surface are not seas of liquid, but only areas of fine volcanic dust.very hard 32% In 1959In 195932%In 1964In 196427%In 1969In 196923%In 1972In 197216%Created by: Tschuka . Statistics based on 686 answers in 2 languages »astronomy riddles » Play Solar System quiz and see all the questions.