The center of our galaxy lies in the direction of the constellation of _____ . False. Astronomy 3. A bright red nebula is called an HII region when it contains.... hydrogen atoms which have been ionized by ultraviolet radiation. Physical Science Exam 1 . Herschel came to the wrong conclusion about the sun's location because...he did not know that interstellar dust made it hard for him to see a large part of the milky way's diskthe solar system is tilted compared to the disk of the galaxyMost of the stars visible to the naked eye at night are ____, which are _____. An essential oil derived from the bergamot orange which is used to flavor tea. The Orion Nebula, now known to be an H II region, was observed in 1610 by Nicolas-Claude Fabri de Peiresc by … The clustering of stars. This result is a ______massive, luminous stars or evolved giants; some of the least common by number but brightest stars; selection effectOne difference between Popular I and Population II stars in the Milky Way is....That Pop I stars have orbits in the disk and Pop II stars have orbits that pass through the diskIn general, Population I stars are _____ than Population II starsIn general, Population I stars are _____ and Population II stars are ______If you made a plot of open clusters on a star map, they would be....Open clusters are gravitationally bound and therefore have a spherical shapeIn a telescopic observation of a field of stars, you see an irregular dark patch. This region is often called "the land of rice + fish" Sichuan cooking style( szechuan) Originating from Sichuan, southwestern China. A Molecular Cloud C. Both D. Neither. YOU MIGHT ALSO LIKE... 9 terms. Regions of Canada. assamica. 17 terms. This is most likely...A bright red nebula is called an HII region when it contains....hydrogen atoms which have been ionized by ultraviolet radiationCompared to a cold molecular cloud at 10 K, an HII region has a temperature about...According to the density-wave theory, spiral arms are blue because they....contain a lot of young stars formed from clouds compressed by the density waveAstronomers believe that the massive object at the center of the Milky Way is a black hole because....observations at X-ray, infrared and radio limit the size of the object to smaller than 10 AUAstronomers have found the black hole at the center of the Milky Way has a mass of about _____ solar massesThe ____ theory offers a likely explanation for the formation of _____ Why does star formation seem to taking place primarily within the spiral arms of the galaxy?The differential rotation of the galaxy collects the free Hydrogen into Giant Star formation occurred first in the ________ of our Galaxy, then continued in the ________, but continues today only in the ________ component of our Galaxy.The primary differentiator for Population I and Population II stars is ________ .Hubble's discovery that the great "spiral nebulae" were actually island universes was made ________ .using Cepheid variables in M31 to estimate distances5 The best evidence that there is a massive Black Hole at the center of our galaxy is ________ .Infrared images of stars near the center moving very rapidl6 Stars in the ________ do not have highly inclined orbits around the Galaxy.Relative metal abundances and orbital motions of the stars in our galaxy indicate: ________ .Star Clusters occur in 2 broad categories; ________ .The primary reason that massive O-type stars are not found in the galactic halo is because they are ________ .too short-lived to have persisted from halo formation until todaWhich astronomer used the locations of Globular Clusters to gain an understanding of the scale and structure of the Milky Way?The spiral arms of our galaxy are most easily identified by the ________ .regions of young, massive stars near the clouds of their birtThe position of the Sun in the Milky Way Galaxy is best described as ________ .in the disk, slightly more than halfway out from the center________ first noticed that, for Cepheid variable stars, there was a direct relation between the luminosity and the period of the variation in their brightnessmolecules in the air scatter the Sun's blue light in random directionA common characteristic of OB Associations and T Associations is ________The chemical abundances in Population I stars ________ .indicates the material they formed from had been enriched from previous starsAn important difference between stars found in globular clusters and those found in open clusters is stars found in globular clusters ________ .Young stars contain heavy elements ("metals") while old stars do not because ________ .the gas out of which young stars were formed already contained metals In our Galaxy, as time goes on, the abundance of metals ________ .The most effective technique to find distances to other galaxies is to look at objects in the galaxies for which we know the ________Population II stars have orbits that ________ Population I starsare heavily inclined to the galactic plane (disk), unlikeThe stars in Open Clusters in the Milky Way ________ .started formation at the same time and in the same general regionThe center of our galaxy contains an extremely massive cluster of starsThe main underlying physical cause for the differences seen in stars of the same cluster is their ________ .The most massive Luminosity Class V star in a clusterRecent evidence suggests that our Sun formed ________The interstellar medium has the property of making background stars appear ________ than they really are from their known distance and spectral type.The first attempts, more than 100 years ago, to determine the structure of our galaxy failed because astronomers were unaware ________ .The HR diagram of a star cluster shows solar type stars (stars with the mass of our Sun) in the process of leaving the main sequence.
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An HII region is Quizlet