Astronomy questions This is a list of recently added questions about astronomy. Play astronomy quiz and see all the questions. Which planet is this globe with such a bland look without any details?Uranus. Upper parts of Uranus' atmosphere are composed of condensed hydrocarbons, mainly methane crystal particles. Contrary to the rest of gas giant planets, it's hard to observe clouds and storm bounds.Created by: smyruhard 58% UranusUranus5295NeptuneNeptune2514MercuryMercury503VenusVenus675planets riddles » 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 48% low temperatureslow temperatures1236lack of oxygenlack of oxygen3490poor gravitypoor gravity1017cosmic rayscosmic rays5390astronautics 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 29% GalaxyGalaxy490Galaxy filamentGalaxy filament435Galaxy clusterGalaxy cluster60SuperclusterSupercluster508space 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% CuriosityCuriosity418OpportunityOpportunity257SojournerSojourner422SpiritSpirit303space 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.1787It is a measure of system's sizeIt is a measure of system's size383Both answers are correctBoth answers are correct662None of above answersNone of above answers630physics 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% MercuryMercury3200VenusVenus377EarthEarth175MarsMars343Solar System riddles » Which era of the universe are we currently living in ?The stelliferous era. There are five eras of the universe which are the primordial era,the stelliferous era, the degenerate era, the black hole era and the dark eraCreated by: Palash Chakrabortyhard 46% The stelliferous eraThe stelliferous era24The degenerate eraThe degenerate era11The primordial eraThe primordial era13The black hole eraThe black hole era4 The closest star to Sun is Proxima Centauri. In which direction we would need to look to see it on the night sky?It is not visible at all. Proxima Centauri is a red dwarf and its average brightness is very low. That is why even though it is closest to Sun, it was discovered not until in 1915.Created by: Ineshard 54% Great BearGreat Bear1187SiriusSirius1358CassiopeiaCassiopeia839it is not visible at allit is not visible at all4105stars riddles » Which is the only moon with active volcanoes?Lo is a very tiny moon that is enormously influenced by the gravity of Jupiter. The great forces of Jupiter and its other moons exert such long pulls on lo that it deforms continuously from strong internal friction. These tides produce tremendous amount of internal friction, which heats the moon and enables its volcanic activityCreated by: ippili_chhard 41% Titan Titan 536GanymedeGanymede753lolo1250EuropaEuropa481Solar System riddles » What is the name of the galaxies group to which Milky Way belong?Virgo Supercluster. The Virgo Supercluster or the Local Supercluster contains at least 100 galaxy groups including the Local Group, which in turn contains the Milky Way and Andromeda Galaxies. Yet, it is one of millions of superclusters in the observable universe.Created by: Krzysztof Moskalhard 46% Supercluster in LibraSupercluster in Libra486Virgo SuperclusterVirgo Supercluster1619Gemini SuperclusterGemini Supercluster767Ophiuchus AuperclusterOphiuchus Aupercluster589 Play astronomy quiz and see all the questions.