The most difficult space riddles A list of space related questions that are most often answered incorrectly Astronomy quiz 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% CuriosityCuriosity29%OpportunityOpportunity18%SojournerSojourner30%SpiritSpirit21%Created by: smyru. Statistics based on 1491 answers in 2 languages »astronomy riddles » 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 30% GalaxyGalaxy32%Galaxy filamentGalaxy filament30%Galaxy clusterGalaxy cluster3%SuperclusterSupercluster33%Created by: smyru. Statistics based on 1549 answers in 2 languages »universe 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 40% a cometa comet11%a moona moon8%an asteroid an asteroid 40%a planeta planet40%Created by: smyru. Statistics based on 2823 answers in 2 languages »Earth 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.hard 41% Neil Alden ArmstrongNeil Alden Armstrong29%Guy LalibertéGuy Laliberté11%Dennis TitoDennis Tito41%Richard GarriottRichard Garriott17%Created by: Paweł Kołodziejczyk. Statistics based on 4536 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 42% supergiant starssupergiant stars8%novaenovae3%supernovaesupernovae45%quasarsquasars42%Created by: globalquiz.org. Statistics based on 7485 answers in 2 languages »light 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 51% It is a measure of the disorder in a closed system.It is a measure of the disorder in a closed system.51%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 answers18%Created by: Władysław Pękala. Statistics based on 3659 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 57% 800 times800 times17%1,321 times1,321 times57%50 times50 times8%10,000 times10,000 times16%Created by: K.R.A.C.. Statistics based on 6025 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 61% 30 minutes30 minutes4%3 hours3 hours15%3 days3 days61%30 days30 days17%Created by: Hitter smasher. Statistics based on 8006 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.easy 78% MercuryMercury78%VenusVenus9%EarthEarth4%MarsMars8%Created by: lanusienka. Statistics based on 4282 answers in 2 languages »Solar System riddles » Play astronomy quiz and see all the questions.