An H II region or HII region is a region of interstellar atomic hydrogen that is ionized. It is typically a cloud of partially ionized gas in which star formation has recently taken place, with a size ranging from one to hundreds of light years, and density from a few to about a million particles per cubic cm. The Orion Nebula, now known to be an H II region, was observed in 1610 by NicolasWhich part of the galaxy contains the coldest gas? ANSWER: Correct Question 3 Choose the best answer. Part A Why do disk stars bob up and down as they orbit the galaxy? ANSWER: Correct Question 4 Choose the best answer. Part A Which part of the galaxy has gas with the hottest average temperature? ANSWER: Correct Question 5 Part A The Sun'sThe baby galaxy managed to remain in an embryonic state as a cold gas cloud of primeval hydrogen and helium for most of the duration of the universe's evolution.Which part of the galaxy contains the coldest gas? the disk. The circular but relatively flat portion of the galaxy is the. disk. The first portion of the galaxy to form was the. halo. A tightly packed group of a few hundred thousand very old stars is a. globular cluster.Which part of the galaxy contains the coldest gas? The halo. Why do disk stars bob up and down as they orbit the galaxy? Because the gravity of other disk stars always pulls them toward the disk. Which part of the galaxy has gas with the hottest average temperature? The halo.
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permits astronomers to sort out the gas clouds and thus map the Galaxy. Universe by Freedman, Geller, and Kaufmann Neutral Hydrogen Map This map shows the distribution of hydrogen gas in a face-on view of the Galaxy. The map suggests a spiral structure. Details in the blank, wedge-shaped region are unknown. Cool gas in this part of the GalaxyThe cold molecular clouds that roam, isolated, throughout the galaxy are even colder, just 10 K to 20 K above absolute zero. As stars, supernovae, cosmic rays, stellar winds and more all provideA spiral galaxy like the Milky Way contains stars, stellar remnants, and a diffuse interstellar medium (ISM) of gas and dust. The interstellar medium consists of 10 −4 to 10 6 particles per cm 3 and is typically composed of roughly 70% hydrogen by mass, with most of the remaining gas consisting of helium.This medium has been chemically enriched by trace amounts of heavier elements that wereA galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias (γαλαξίας), literally "milky", a reference to the Milky Way.Galaxies range in size from dwarfs with just a few hundred million (10 8) stars to giants with one hundred trillion (10 14) stars, each orbiting its galaxy's center
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Neutral Hydrogen: Most of the interstellar medium is in the form of neutral hydrogen gas (HI). The typical densities of neutral hydrogen in the Galaxy is one atom per cubic centimeter. This gas is cold and the electron is usually in its ground state.The cold gas in M31 is concentrated in very filigree structures in the spiral arms. The CO line appears well suited to trace the spiral arm structure. The distinctive spiral arms are seen at...Where in our galaxy would you find the coldest gas in the interstellar medium? (a) the disk (b) the halo (c) the bulge. Oct 01 2019 09:23 AM. 1 Approved Answer. sasibhushan r answered on December 18, 2020. 5 Ratings, (9 Votes) The interstellar reddening map showed that the interstellar space is mainly composed of hydrogen, helium gas (99%) andWithin the Milky Way, molecular gas clouds account for less than one percent of the volume of the interstellar medium (ISM), yet it is also the densest part of the medium, comprising roughly half of the total gas mass interior to the Sun's galactic orbit. The bulk of the molecular gas is contained in a ring between 3.5 and 7.5 kiloparsecs (11,000 and 24,000 light-years) from the center of theThe Andromeda Galaxy (IPA: / æ n ˈ d r ɒ m ɪ d ə /), also known as Messier 31, M31, or NGC 224 and originally the Andromeda Nebula (see below), is a barred spiral galaxy approximately 2.5 million light-years (770 kiloparsecs) from Earth and the nearest major galaxy to the Milky Way. The galaxy's name stems from the area of Earth's sky in which it appears, the constellation of Andromeda
When you look at a standard galaxy, most of the light comes from the stars in visual wavelengths and is frivolously allotted all the way through the galaxy. However, for those who observe some galaxies, you'll be able to see intense gentle coming from their nuclei. And if you happen to take a look at those same galaxies in the X-ray, ultraviolet, infrared and radio wavelengths, they look like giving off huge amounts of energy, it seems that from the nucleus. These are energetic galaxies, which constitute an overly small proportion of all galaxies. There are four classifications of energetic galaxy, but the sort we observe may rely more upon our viewing angle than structural differences.
Seyfert galaxiesRadio galaxiesQuasarsBlazarsTo provide an explanation for lively galaxies, scientists must be able to explain how they emit such massive amounts of power from such small spaces of the galactic nuclei. The most authorized speculation is that at the middle of each of those galaxies is a large or supermassive black hole. Around the black hole is an accretion disk of all of a sudden spinning gas that is surrounded by means of a torus (a donut-shaped disk of gas and mud). As the material from the accretion disk falls into the space around the black hollow (the tournament horizon), it heats to millions of levels Kelvin and is speeded up outward in the jets.
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Seyfert galaxiesDiscovered by means of Carl Seyfert in 1943, these galaxies (2 % of all spiral galaxies) have vast spectra indicating cores of sizzling, low-density ionized gas. The nuclei of these galaxies exchange brightness each and every few weeks, so we know that the items in the middle should be quite small (about the measurement of a sun gadget). Using Doppler shifts, astronomers have spotted that velocities at the middle of Seyfert galaxies are about 30 instances more than those of normal galaxies.
Radio galaxiesRadio galaxies are elliptical (0.01 percent of all galaxies are radio galaxies). Their nuclei emit jets of high-velocity gas (near the pace of light) above and under the galaxy -- the jets have interaction with magnetic fields and emit radio signals.
Quasars (quasi-stellar gadgets)
Quasars have been found out in the early Sixties. About 13,000 had been came upon, but there could be as many as 100,000 in the market [supply: A Review of the Universe]. They're billions of gentle years clear of the Milky Way and are the most full of life objects in the universe. The extreme brightness of quasars can range over daylong periods, which signifies that the power is coming from an excessively small area. Thousands of quasars were discovered, and they're believed to be emanating from the cores of far away galaxies.
BlazarsBlazars are a sort of active galaxy -- about 1,000 had been cataloged [source: A Review of the Universe]. From our standpoint, we're looking "head-on" at the jet emanating from the galaxy. Like quasars, their brightness can fluctuate all of a sudden -- every so often in less than someday.
Take a have a look at the hyperlinks on the subsequent page for more information about galaxies.
Originally Published: Feb 7, 2008
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