Space questions This is a list of recently added questions about space. 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. Created by: smyruhard 41% a cometa comet311a moona moon228an asteroid an asteroid 1135a planeta planet1166universe 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. Created by: smyruvery hard 30% GalaxyGalaxy501Galaxy filamentGalaxy filament468Galaxy clusterGalaxy cluster61SuperclusterSupercluster522astronomy 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.Created by: smyruvery hard 30% CuriosityCuriosity444OpportunityOpportunity275SojournerSojourner460SpiritSpirit321astronomy 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.Created by: Władysław Pękalahard 51% It is a measure of the disorder in a closed system.It is a measure of the disorder in a closed system.1904It is a measure of system's sizeIt is a measure of system's size414Both answers are correctBoth answers are correct700None of above answersNone of above answers665physics 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 78% MercuryMercury3370VenusVenus397EarthEarth182MarsMars359planets 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.Created by: Paweł Kołodziejczykhard 41% Neil Alden ArmstrongNeil Alden Armstrong1334Guy LalibertéGuy Laliberté545Dennis TitoDennis Tito1870Richard GarriottRichard Garriott802tourism 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 57% 800 times800 times10751,321 times1,321 times346450 times50 times53510,000 times10,000 times972Solar System 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.Created by: globalquiz.orghard 42% supergiant starssupergiant stars638novaenovae300supernovaesupernovae3382quasarsquasars3180light 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.Created by: Hitter smasheraverage 61% 30 minutes30 minutes3583 hours3 hours12623 days3 days496030 days30 days1440rockets riddles » Play astronomy quiz and see all the questions.