Sun questions This is a list of recently added questions about Sun. Play Sun quiz and see all the questions. What type of plasma is Sun composed of?Hot. The Sun is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. Hot plasmas (thermal plasmas) have electrons and the heavy particles at the same temperature, i.e. they are in thermal equilibrium with each other. Cold plasmas (nonthermal plasmas) on the other hand have the ions and neutrals at a much lower temperature, whereas electrons are much "hotter".Created by: Ninjaihard 40% coldcold493hothot1815ultracoldultracold901none of the abovenone of the above1252universe 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.Created by: Ninjaivery hard 32% chromospherechromosphere457coronacorona1096stratospherestratosphere336photospherephotosphere899Solar System 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.Created by: Tschuka very hard 26% within every 225 million yearswithin every 225 million years190within 250 million yearswithin 250 million years233within 300 million yearswithin 300 million years169within 350 million yearswithin 350 million years123time 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. Created by: Tschuka very hard 36% refraction of light in ice crystalsrefraction of light in ice crystals3481refraction in the lens of the eye or lensrefraction in the lens of the eye or lens3038refraction of light in water dropsrefraction of light in water drops2446reflections from the water surfacereflections from the water surface665atmosphere 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, Created by: Tschuka very hard 38% The Kepler Space TelescopeThe Kepler Space Telescope1030Space Chandra TelescopeSpace Chandra Telescope206The Hubble Space TelescopeThe Hubble Space Telescope1137Atacama Large Millimeter / submillimeter Array (ALMA)Atacama Large Millimeter / submillimeter Array (ALMA)324astronautics riddles » What is the temperature of the center of the Sun?16 million degrees Celsius. The surface temperature is only 5500 degrees Celsius.Created by: Tschuka very hard 19% 16 thousand degrees Celsius16 thousand degrees Celsius8916 million degrees Celsius16 million degrees Celsius8216 billion degrees Celsius16 billion degrees Celsius15316 trillion degrees Celsius16 trillion degrees Celsius95temperatures 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.Created by: Tschuka hard 49% Lower temperature and strong electric fieldLower temperature and strong electric field192Higher temperatureHigher temperature296Lower temperature and strong magnetic fieldLower temperature and strong magnetic field744These are holes in the photosphereThese are holes in the photosphere285stars 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.Created by: Katarzyna Dąbrowskavery hard 39% 5 years5 years71911 years11 years213022 years22 years10021300 years1300 years1512astronomy 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. Created by: smyruvery hard 21% 1839183930188318834519461946371958195825energy riddles » Which chemical element has been named after the Sun?Helium was first discovered in 1868 as the unexpected line in the spectrum of the chromosphere of the Sun - and so it was named after the Greek word Helios (Sun).Created by: Shankar Kumareasy 70% GoldGold3194HeliumHelium10951OxygenOxygen296PhosphorusPhosphorus1179elements riddles » Play astronomy quiz and see all the questions.