10 most difficult Sun riddles A list of Sun related questions that are most often answered incorrectly Astronomy quiz What is the temperature of the center of the Sun?16 million degrees Celsius. The surface temperature is only 5500 degrees Celsius.very hard 16% 16 thousand degrees Celsius16 thousand degrees Celsius21%16 million degrees Celsius16 million degrees Celsius16%16 billion degrees Celsius16 billion degrees Celsius38%16 trillion degrees Celsius16 trillion degrees Celsius24%Created by: Tschuka . Statistics based on 368 answers in 2 languages »temperatures riddles » When was the photovoltaic cell invented?1839. The first experimental photovoltaic cell has been built by Edmund Becquerel, French physicist aged 19 at the time, in his father garage in 1839. In 1883 Charles Fritts created the first solid state cell. very hard 20% 1839183920%1883188331%1946194628%1958195819%Created by: smyru. Statistics based on 106 answers in 2 languages »energy riddles » In what period of time does the Sun make a full turn around the center of the Milky Way?Within every 225 million years. The sun performs a full turn around the center of our galaxy during 225 million years.very hard 26% within every 225 million yearswithin every 225 million years26%within 250 million yearswithin 250 million years33%within 300 million yearswithin 300 million years24%within 350 million yearswithin 350 million years16%Created by: Tschuka . Statistics based on 645 answers in 2 languages »time riddles » The bright circle around the Sun seen in the picture is known as a halo. What causes it?Refraction of light in ice crystals. Halo is the name for a family of optical phenomena produced by light interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky. Among the best known halo types are the circular halo (properly called the 22° halo), Other common optical phenomena involving water droplets rather than ice crystals include the glory and the rainbow. very hard 35% refraction of light in ice crystalsrefraction of light in ice crystals35%refraction in the lens of the eye or lensrefraction in the lens of the eye or lens31%refraction of light in water dropsrefraction of light in water drops25%reflections from the water surfacereflections from the water surface6%Created by: Tschuka . Statistics based on 9446 answers in 2 languages »atmosphere riddles » Which telescope was designed to detect exoplanets?The Kepler Space Telescope. Kepler is a space observatory launched by NASA to discover Earth-size planets orbiting other stars. Named after astronomer Johannes Kepler, the spacecraft was launched on March , 2009, in. Designed to survey a portion of our region of the Milky Way to discover Earth-size exoplanets in or near habitable zones and estimate how many of the billions of stars in the Milky Way have such planets, very hard 37% The Kepler Space TelescopeThe Kepler Space Telescope37%Space Chandra TelescopeSpace Chandra Telescope7%The Hubble Space TelescopeThe Hubble Space Telescope43%Atacama Large Millimeter / submillimeter Array (ALMA)Atacama Large Millimeter / submillimeter Array (ALMA)11%Created by: Tschuka . Statistics based on 2425 answers in 2 languages »astronautics riddles » The Sun activity increases during every ...11 years. Basic period of time in which the activity of Sun is increasing is 11 years. It is visible on the chart.very hard 39% 5 years5 years13%11 years11 years39%22 years22 years18%1300 years1300 years28%Created by: Katarzyna Dąbrowska. Statistics based on 5207 answers in 2 languages »universe riddles » What is larger on the sky: the Moon or the Sun? (by apparent size)Sometimes the Moon, sometimes the Sun. The Moon's orbit is elliptical, and its apparent diameter varies by 10%. This is why both total eclipses (if the Moon is larger) and annular eclipses (if the Sun is larger) happen.hard 43% the Sunthe Sun18%the Moonthe Moon23%both are identicalboth are identical14%sometimes the Moon, sometimes the Sunsometimes the Moon, sometimes the Sun43%Created by: pan Krzyżówka. Statistics based on 11486 answers in 2 languages »sky riddles » In which month is the Earth closest to the Sun?In January. Earth's perihelion occurs around January 3, and the aphelion around July 4. The distance change is about 3.5%, which gives 6.9% increase in solar energy reaching the Earth at perihelion relative to aphelion. Since the southern hemisphere is tilted toward the perihelion, the southern hemisphere receives more energy from the Sun than does the northern over the course of a year. hard 44% in Januaryin January44%in Marchin March6%in Junein June32%there is no differencethere is no difference15%Created by: globalquiz.org. Statistics based on 14809 answers in 4 languages »hard simple questions riddles » What properties do sunspots have?Lower temperature and strong magnetic field. Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection.hard 47% Lower temperature and strong electric fieldLower temperature and strong electric field12%Higher temperatureHigher temperature20%Lower temperature and strong magnetic fieldLower temperature and strong magnetic field47%These are holes in the photosphereThese are holes in the photosphere19%Created by: Tschuka . Statistics based on 1271 answers in 2 languages »stars riddles » When is the Sun directly overhead (at the zenith) in Rome?Never. Tropic of Cancer and Tropic of Capricorn mark the northernmost and southernmost latitudes at which the sun may be seen directly overhead. Since the whole Europe is north of Tropic of Cancer, it is impossible to see sun at the zenith there.hard 57% 21th of June21th of June21%20th of March and 22 of September20th of March and 22 of September14%16th of August16th of August6%NeverNever57%Created by: София. Statistics based on 24359 answers in 2 languages »astronomy riddles » Play astronomy quiz and see all the questions.