The most difficult space riddles A list of space related questions that are most often answered incorrectly Astronomy quiz Which of the following cosmic structures is the largest?Galaxy filaments are the largest known structures in the universe. They group galaxy superclusters, which in turn are formed by cluster composed of galaxies. Hercules–Corona Borealis Great Wall is considered the largest known structure of Universe. It is estimated to span 10 billions light years. very hard 29% GalaxyGalaxy28%Galaxy filamentGalaxy filament29%Galaxy clusterGalaxy cluster3%SuperclusterSupercluster38%Created by: smyru. Statistics based on 2163 answers in 2 languages »universe riddles » Which rover was the first to explore Mars?Sojourner was the first Mars rover. It was much smaller then Curiosity, whose wheel is about the size of the whole Sojourner. It landed on July 4, 1997 as part of Mars Pathfinder mission on Mars's Ares Vallis and remainded in contact with Earth till September 27, 1997.very hard 30% CuriosityCuriosity30%OpportunityOpportunity18%SojournerSojourner30%SpiritSpirit19%Created by: smyru. Statistics based on 2291 answers in 2 languages »astronomy riddles » What is the name of first in history cosmic tourist (astrotourist)?Dennis Tito. Dennis Anthony Tito is an American engineer and multimillionaire, most widely known as the first space tourist to fund his own trip into space. Tito paid a reported $20 million to the Russian Federal Space Agency.very hard 38% Neil Alden ArmstrongNeil Alden Armstrong30%Guy LalibertéGuy Laliberté12%Dennis TitoDennis Tito38%Richard GarriottRichard Garriott18%Created by: Paweł Kołodziejczyk. Statistics based on 5782 answers in 2 languages »tourism riddles » What are the most luminous objects in the universe?Quasars. A quasar is an extremely energetic source of radiation powered by accretion disc around galaxy's central supermassive black hole. Quasars were much more common in the early universe, as all known quasars are extremely distant.hard 41% supergiant starssupergiant stars8%novaenovae3%supernovaesupernovae46%quasarsquasars41%Created by: globalquiz.org. Statistics based on 8718 answers in 2 languages »light riddles » What object collided with Earth according to giant impact hypothesis?A planet. According to the giant impact hypothesis Earth once collided with a planet of Mars size usually referred to as Theia, a titaness of Greek mythology, mother of Selene - Moon goddess, which is to reflect the believe the collision was an origin of the Moon. hard 43% a cometa comet10%a moona moon8%an asteroid an asteroid 37%a planeta planet43%Created by: smyru. Statistics based on 4156 answers in 2 languages »Earth riddles » What is entropy?It is a measure of the disorder in a closed system. It is a measure of the disorder or randomness in a closed system. The second law of thermodynamics states that if isolated thermodynamic system spontaneously evolves into another state of equilibrium, its entropy will always increase. The term was invented by Rudolf Clausius.hard 50% It is a measure of the disorder in a closed system.It is a measure of the disorder in a closed system.50%It is a measure of system's sizeIt is a measure of system's size11%Both answers are correctBoth answers are correct19%None of above answersNone of above answers19%Created by: Władysław Pękala. Statistics based on 4869 answers in 2 languages »physics 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.hard 55% 800 times800 times19%1,321 times1,321 times55%50 times50 times8%10,000 times10,000 times15%Created by: K.R.A.C.. Statistics based on 7635 answers in 2 languages »planets riddles » How long did it take Apollo 11 flight to reach the Moon? 3 days. It took 1 minute of flight to reach Mach 1 and 12 minutes to enter Earth's orbit. After one and a half orbits, the third-stage engine pushed the spacecraft onto its three-day long travel to the Moon.average 62% 30 minutes30 minutes4%3 hours3 hours15%3 days3 days62%30 days30 days17%Created by: Hitter smasher. Statistics based on 8783 answers in 2 languages »rockets 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.very easy 80% MercuryMercury80%VenusVenus8%EarthEarth3%MarsMars7%Created by: lanusienka. Statistics based on 5850 answers in 2 languages »Solar System riddles » Play astronomy quiz and see all the questions.