Stars/Quiz

Stars is a lecture about an entity, source, and/or object observed using radiation astronomy.

You are free to take this quiz based on stars. Once you've read and studied it, the links contained within, listed under See also, External links and the template, you should have adequate background to score 100 %.

Enjoy learning by doing!

Quiz
{Which of the following are radiation astronomy phenomena associated with a star? + ultraviolet emission + X-ray emission + gamma-ray emission + neutron emission + 7Be emission + meteor emission
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{Yes or No, The Norikura Solar Observatory uses its own designations for solar active regions rather than those of other observatories or NOAA. - Yes + No
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{Which of the following is not a characteristic of solar active regions? - lithium - nucleosynthesis - coronal clouds - spot central meridian passage + a surface coverage of at least 95%.
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{During the late 1600s the sunspot cycle lost its usual intensity and became what? { Maunder Minimum (i) }
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{True or False, Naked starspots seen in Hα which are devoid of plage are never associated with coronal holes. - TRUE + FALSE
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{The Sun as a star has what geographical property? - it's a primordial population III star - it passes once a year across the Lockman Hole - silicates have been discovered in its interior structure - optical reflectance studies have found evidence of magnesium - it has a surface temperature of ~700 K + it has a longitude and latitude grid system for locating surface features
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{Complete the text: Early spectroscopy of the Sun using estimates of the { intensity|line intensities (i) } of several lines by eye to derive the { abundance|abundances (i) } of elements concluded that the { Sun (i) } is largely made of { hydrogen|H (i) }.
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{True or False, Any small luminous dot appearing in the cloudless portion of the night sky, especially with a fixed location relative to other such dots is most likely to be a galaxy. - TRUE + FALSE
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{When faculae are present, what characteristics are readily observed? + bright spots + bright patches + granules + temporary increases in TSI + arising between granules - neon clouds
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{In each latitudinal hemisphere for the greater part of the starspot period there is practically but one what? { zone (i) }
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{True or False, At least in sodium emission astronomy, Mercury is a dwarf gaseous object. + TRUE - FALSE
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{Which of the following is not a prominent feature associated with stellar clouds? - coronal mass ejections - magnetic clouds + rotation - coronal clouds - plasma - magnetic field lines
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{In general there is no proper motion at all in the plage or the surrounding? { plagettes (i) }
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{True or False, "Some prominences break apart and give rise to coronal mass ejections." + TRUE - FALSE
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{Which of the following is not a phenomenon usually associated with starspots? - a photosphere - a hole in the granulated photosphere + production of 7Be - rotation - starspot cycle - sunspots - flip-flop cycle
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{Complete the text: "When a prominence is viewed from a different perspective so that it is against the { Sun|sun|star (i) } instead of against space, it appears { dark|darker (i) } than the surrounding { background (i) }.
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{True or False, In 1947, G. E. Kron proposed that starspots were the reason for periodic changes in brightness on blue dwarfs. - TRUE + FALSE
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{Which of the following is not a phenomenon associated with a flip-flop cycle? - active regions - hemisphere shifts - binary RS CVn stars - single stars - cyclical period + meridian passage
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{A Mt. Wilson spot number usually corresponds with which other region number? { Hale|McMath|Big Bear (i) }
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{True or False, Hale region numbers are greater for the same regions than NOAA numbers. + TRUE - FALSE
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{Which of the following sunspot phenomena are associated with the Maunder minimum? + extensively long quiet Sun + lowest 14C concentration from as far back as 3100 b2k. + a period of lower-than-average European temperatures - a surface coverage of about 88% + only about 50 sunspots during one 30-year period + 11-year cycles
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{Stellar observation is performed all around the surface of the Earth by? { location (i) }
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{True or False, The Kodaikanal Solar Observatory is a solar observatory owned and operated by the Indian Institute of Astrophysics. + TRUE - FALSE
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{Which of the following are phenomena usually associated with a heliostat? + geographic coordinates + a mirror which turns so as to keep reflecting sunlight toward a predetermined target + the target is usually stationary + computer control + a two-axis motorized system - altitude
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{Naked spots are long-lived and show rotation rates close to what? { Newton-Nunn curve (i) }
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{True or False, Helicity (H) is a quantitative measure of the chiral properties of the structures observed in the solar atmosphere. + TRUE - FALSE
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{Which of the following are associated with a stellar control group? - rocky objects + gaseous objects + plasma objects + a photosphere + rotation - watery surface + spots
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{The relative abundances of solar cosmic rays reflect those of the solar { photosphere (i) }
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{True or False, The surface of a star is a known source of neutrons. - TRUE + FALSE
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{Which of the following are characteristic of stellar proton astronomy? + the solar wind + polar coronal holes + protons originating from the photosphere - the electron neutrino + GOES 11 - neutrons
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{Using a coordinate system, starspot passage is generally noted by what meridian? { central|central meridian (i) }
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{True or False, "75% of the naked sunspots represented the return of large dominant f spots which had been part of large active regions during previous rotations." - TRUE + FALSE
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{Which geographical phenomena are associated with starspots? + moving across the surface of the star - manifesting intense magnetic fields - a north geographic and magnetic pole + rotation + a prime meridian + average starspot latitudes + the stellar equator
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{Neutrinos detected from the solar octant may be from nucleosynthesis within the coronal cloud in the near vicinity of the Sun or perhaps from nucleosynthesis occurring within what theoretical interior structure of the Sun? { the core|core (i) }
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{True or False, X-ray photons can be effectively backscattered by photosphere atoms and electrons. + TRUE - FALSE
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{Phenomena associated with the color index? + a simple numerical expression + the magnitude of an object + a set of passbands or filters - brightenings + UBVRI filters + particular combinations of glass filters and photomultiplier tubes
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{The Na I green lines at 568.2 and 568.8 nm arise in the what? { photospheric layers|photosphere (i) }
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{True or False, Stars of spectral classes F and G, such as our sun, have color temperatures that make them look "greenish". - TRUE + FALSE
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{Which of the following are photospheric observatories on Earth? - Chandra X-ray Observatory + Big Bear - TRACE + Kodaikanal - the Hubble + Lomnický štít + McMath-Pierce - SOFIA
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{Sayan Observatory is located in. { Buryatia|Irkutsk (i) }
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{True or False, Some observed properties of the Sun still defy explanation, such as the degree of Li depletion: the solar Li abundance is roughly a factor of 200 below the meteoritic abundance. + TRUE - FALSE
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{Which of the following are associated with the McMath-Pierce Solar Telescope? - a launch location + Kitt Peak National Observatory + a heliostat + a distinctive diagonal shaft that continues underground + a theoretical resolution of 0.07" - NOAA designations
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{The metallicity is often expressed as "[Fe/H]", which represents the what of the ratio? { logarithm|log (i) }
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{True or False, Astrognosy is the composition of a star. + TRUE - FALSE
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{Which of the following observatories are solar observatories? + The Huairou Solar Observing Station in China + Mauna Loa Solar Observatory - Los Alamos National Solar Laboratory + National Solar Observatory + Mees Solar Observatory - CERN
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{About one third of solar ejecta observed by satellites at Earth is composed of what? { magnetic clouds (i) }
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{True or False, A spotless flare may occur in a plage region during its first rotation. + TRUE - FALSE
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{Which of the following are stellar observatory satellites? + Einstein Observatory + OSO 7 + Hinode + High Energy Astronomy Observatory 1 + Koronas-Foton + STEREO
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{Suborbital stellar probing may be accomplished from different geographical locations on Earth using? { sounding rockets|aircraft|balloons|rockets (i) }
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{True or False, The Mauna Kea Observatories are used for scientific research across the electromagnetic spectrum from visible light to radio, and comprise the largest such facility in the world. + TRUE - FALSE
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{Which series of emission lines from hydrogen often occur in the visible spectrum of a star? - Paschen series - Brackett series - Pfund series - Lyman series - Humphreys series - Rydberg series + Balmer series
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{True or False, Helium does not occur in the photosphere because it was first detected during a stellar eclipse. - TRUE + FALSE
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{Which of the following phenomena are associated with the core of a star? - origin of the magnetic field - the convection zone - the tachocline + stellar neutrinos - radiative zone + gamma-rays
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{True or False, Astrography is the geography of a star. + TRUE - FALSE
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{Which of the following are green radiation astronomy phenomena associated with the Sun? + the color of the upper rim as seen from Earth + an excess brightness at or near the edge of the Sun + the iron XIV green line - neutron emission + polar coronal holes - meteor emission + changes in the line-blanketing
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{True or False, The Sun has a net positive charge on its surface. - TRUE + FALSE
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{True or False, The Hβ emission line does not appear when the F492M filter is used on the Hubble Space Telescope because its wavelength is 486.1 nm. - TRUE + FALSE
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Hypotheses

 * 1) Stars that emit light do so because they are receiving electron irradiation.