Science Questions
Explore questions in the Science category that you can ask Spark.E!
When you plot the position of Sun-like stars, you will find that ___.a.Sun-like stars are only found in the inner 2/3 of the diskb.Sun-like stars are only found in the outer 2/3 of the diskc.Sun-like stars are found in and out of spiral armsd.Sun-like stars are left behind by the spiral arms that created theme.almost all Sun-like stars are found in spiral arms
One of the most important features that must be explained by models during the formation of the galaxy is the ____.a.importance of spiral arms to star formationb.accumulation of dark matter in the coronac.formation of spiral armsd.formation of the central supermassive black holee.differences in age and metallicity of stars, especially in the halo
The mass of the black hole in the center of the galaxy has been determined by observing the motion of stars orbiting it.
Our Milky Way Galaxy is a perfect example of a grand-design galaxy.
Spiral arms are clearly visible features of galaxies because most Sun-like stars in the disk are found there.
Based on Shapley's determination of the center of the galaxy, the Sun is located ____.a.near the center of the galaxyb.in the middle portion of the galactic diskc.at the edge of the galactic bulged.at the outer edge of the galactic diske.in the galactic halo
Which object would be absent in the galactic halo?a.Cepheid variablesb.red giantsc.white dwarfsd.emission nebulae.e.old main sequence stars
Harlow Shapley made the first accurate determination of the position of the center of the galaxy by studying ____.a.open clustersb.spiral tracersc.emission nebulaed.globular clusterse.stellar associations
The Sun orbits the center of the galaxy about once every ____.a.200,000,000 yearsb.20,000,000 yearsc.2,000,000 yearsd.200,000 yearse.2,000,000,000 years
Dark matter is ___.a.an unknown type of mass that does not emit or absorb photonsb.the substance of which black holes are madec.a cloud of black holes and brown dwarfs in the galactic halod.a theory to explain galactic formation that has been proven wronge.extremely cold, supermassive molecular clouds in the disk
What property of a Cepheid variable can you determine if you know its period?a.absolute magnitudeb.radiusc.surface temperatured.masse.apparent magnitude
What is the monolithic collapse hypothesis unable to explain?a.The low density of material in the halo, compared to the central bulgeb.The elongated bar shape of the central bulgec.The difference in metallicity between the spherical component and the disk component of the galaxyd.The circular motion of stars in the galactic diske.The randomly oriented, elongated orbits of stars in the bulge and halo
Galactic fountains are an important way to explain _____.a.the generation and support of spiral density wavesb.the distribution of metals in and above the plane of the galactic diskc.the formation of the galactic disk from the first stages of our galaxyd.why the spiral arms are active sites of star formatione.the nature of dark matter
In which area of the galaxy would you find stars with fairly circular orbits about the galactic center?a.halob.central bulgec.diskd.coronae.galactic center
Which statement about stellar populations is correct?a.Population I stars are found in the bulge; Population II stars are found in the disk and halo.b.Population I stars are found in the halo; Population II stars are found in the disk and bulge.c.Population II stars are found in the disk; Population I stars are found in the bulge and halo.d.Population I stars are found in the disk and halo; Population II stars are found in the bulge.e.Population I stars are found in the disk; Population II stars are found in the bulge and halo.
Consider the following electromagnetic waves ALL traveling in space (vacuum). Which one travels faster? a. radio wavesb. X-raysc. gamma raysd. all travel at the same speed
Consider a gamma ray traveling in space (vacuum) with a given wavelength and given frequency. If the wavelength were to be doubled, the new frequency of the gamma ray would be a. Squaredb. no change in the frequencyc. Halvedd. Doubled
Spiral arms are obvious-easily-seen features-because they contain ____.a.supernovaeb.sun-like starsc.atomic hydrogen cloudsd.OB associationse.dense molecular clouds
The following objects are found in a spiral arm of a galaxy. Which is the exception?a.population II starsb.emission nebulaec.OB associationsd.clouds of gas and duste.population I stars
The accompanying graph above (Figure 15-1) clearly shows that ____.a.RR Lyrae stars can have longer pulsation periods than Cepheid variablesb.RR Lyrae stars are always dimmer than Cepheid variables.c.Type II Cepheid variables always have shorter pulsation periods than Type I Cepheidsd.Type I Cepheids are always more distant than Type II Cepheidse.Type I Cepheid variables are always brighter than Type II Cepheids