An HII region is Quizlet


all of the above.
A. Bold flavors, particularly the pungency and spiciness resulting from the liberal use of garlic, and chili peppers and the uniquee flavor of the Sichuan pepper. Abdominopelvic regions.

Physical Science Exam 1 .

The energy that is responsible for ionizing and heating the hydrogen in an emission nebula comes from a central star that has a surface temperature in excess of 20,000 K.

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 _____
39 terms. Philippine Regions. Astringency. The Milky Way Galaxy should be rotating faster than we observe it to be.

The drying sensation in the mouth due to high levels of unoxidized polyphenols in a tea. Astronomy 3. An H II region or HII region is a region of interstellar atomic hydrogen that is ionized.

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.

Regions of the Philippines.

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