10 most difficult universe riddles A list of ten (out of 18) universe related questions that are the most often answered incorrectly Universe quiz What are the Perseids meteor showers associated with?Comet Swift–Tuttle. In 1866, after the perihelion passage of Swift-Tuttle in 1862, the Italian astronomer Giovanni Virginio Schiaparelli discovered the link between meteor showers and comets. His findings put new light on a subject, and changed the approach of astronomers to comets. very hard 22% Comet HalleyComet Halley36%Comet Swift–TuttleComet Swift–Tuttle22%Comet Shoemaker–LevyComet Shoemaker–Levy18%Apophis AsteroidApophis Asteroid22%Created by: Ninjai. Statistics based on 2576 answers in 3 languages »astronomy riddles » The idea that the nascent universe passes through the phase of exponential expansion, which was driven by the positive density of vacuum energy, is called;Cosmic inflation. Alan Guth formally proposed the idea of cosmic inflation in 1981, the idea that the nascent universe passed through a phase of exponential expansion that was driven by a positive vacuum energy density (negative vacuum pressure).very hard 27% Cosmic inflationCosmic inflation27%Grand unification theoryGrand unification theory25%Theory of SupersymmetryTheory of Supersymmetry15%All answers are correct.All answers are correct.31%Created by: Tschuka. Statistics based on 4857 answers in 2 languages »space riddles » Which spacecraft flew by and photographed the Halley's comet in 1986?Giotto became the first spacecraft to make close up observations of a comet. On 13 March 1986, the mission succeeded in approaching Halley's nucleus at a distance of 596 kilometers. It was also the first spacecraft to return from interplanetary space and perform an Earth swing by. The spacecraft was named after the Early Italian Renaissance painter Giotto di Bondone.very hard 29% CassiniCassini20%GalileoGalileo37%GiottoGiotto29%RosettaRosetta12%Created by: Ninjai. Statistics based on 164 answers in 3 languages »astronomy riddles » The celestial sphere is divided into ...88 constellations. The current list of 88 constellations recognized by the International Astronomical Union since 1922 is based on the 48 listed by Ptolemy in his Almagest in the 2nd century, with early modern modifications and additions In 1930, the boundaries between the 88 constellations were devised by Eugène Delporte along vertical and horizontal lines of right ascension and declination.very hard 30% 22 constellations22 constellations15%44 constellations44 constellations31%66 constellations66 constellations23%88 constellations88 constellations30%Created by: Tschuka. Statistics based on 1762 answers in 3 languages »astronomy riddles » Orion Nebula, visible to the naked eye, is a type of...Emission nebula. An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy photons emitted from a nearby hot star. The nebula's color depends on its chemical composition and degree of ionization. Due to the prevalence of hydrogen in interstellar gas, and its relatively low energy of ionization, many emission nebulae appear red due to the strong emissions of the Balmer series.very hard 30% reflection nebulareflection nebula14%emission nebulaemission nebula30%planetary nebulaplanetary nebula13%supernova remnantsupernova remnant40%Created by: Ninjai. Statistics based on 3854 answers in 3 languages »space 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 32% GalaxyGalaxy24%Galaxy filamentGalaxy filament32%Galaxy clusterGalaxy cluster3%SuperclusterSupercluster39%Created by: smyru. Statistics based on 4410 answers in 3 languages »astronomy riddles » How is the visible surface of the Sun called?Photosphere. The photosphere is a layer below which the Sun becomes opaque to visible light. It is tens to hundreds of kilometers thick, and is slightly less opaque than air on Earth. Because the upper part of the photosphere is cooler than the lower part, an image of the Sun appears brighter in the center than on the edge or limb of the solar disk, in a phenomenon known as limb darkening.very hard 32% chromospherechromosphere16%coronacorona38%stratospherestratosphere11%photospherephotosphere32%Created by: Ninjai. Statistics based on 2930 answers in 3 languages »Sun riddles » What is the source of the most powerful release of energy in the universe, second in scale only to the Big Bang?Gamma-ray bursts are the brightest in the universe, even brighter than the glare of quasars, second only to the brightness and power of the Big Bang. It is believed that arise during disruption of stars by black holes.very hard 33% supermassive starssupermassive stars4%quasarsquasars19%gamma-ray burstgamma-ray burst33%supernovasupernova42%Created by: Krzysztof Moskal. Statistics based on 4296 answers in 2 languages »stars riddles » Which of the constellations is the largest? (seen from the ground) Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. Also one of the longest at over 100 degrees, It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake. very hard 35% Big DogBig Dog9%HydraHydra35%OrionOrion23%Great BearGreat Bear31%Created by: Tschuka. Statistics based on 2308 answers in 3 languages »astronomy riddles » What was the most beautiful comet of the second half of the twentieth century, with two tails visible to the naked eye?Comet Hale-Bopp. Hale–Bopp was discovered on July 23, 1995 separately by Alan Hale and Thomas Bopp prior to it becoming naked-eye visible on Earth. Comet Hale-Boppit was visible to the naked eye for a record 18 months, twice as long as the previous record holder, the Great Comet of 1811. Accordingly, Hale–Bopp was dubbed the Great Comet of 1997.very hard 37% Halley's cometHalley's comet50%Comet McNaughtComet McNaught6%Comet Hale-BoppComet Hale-Bopp37%There was no such cometThere was no such comet5%Created by: Tschuka. Statistics based on 1920 answers in 2 languages »comets riddles » Play universe quiz and see all the questions.