If the period of these ripples is 0.1 s, what is their wavelength? GMCs are so large that "local" ones can cover a significant fraction of a constellation; thus they are often referred to by the name of that constellation, e.g.





A molecular cloud is an accumulation of interstellar gas and dust. …divided into two broad classes: dark nebulae and bright nebulae. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox.



Professor of Astronomy, University of Wisconsin, Madison. These clouds turn out to be the birthplaces of most stars in our Galaxy.The masses of molecular clouds range from a thousand times the mass of the Sun to about 3 m… The largest molecular clouds are



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10 m 0 c. 101 m O d. 1000 m Get more help from Chegg Ripples of pressure in a deep space molecular cloud with a pressure of 0.02 Pa travel with a speed of 100 m/s.

These clouds have cold interiors with characteristic temperatures of only 10–20 K; most of their gas atoms are bound into molecules. Login As we saw in Between the Stars: Gas and Dust in Space, the most massive reservoirs of interstellar matter—and some of the most massive objects in the Milky Way Galaxy—are the giant molecular clouds. Get exclusive access to content from our 1768 First Edition with your subscription.

The gas pressure within a molecular cloud counters both this gravitational force and the pressure exerted by the external interstellar medium. Features  Molecular cloud, interstellar clump or cloud that is opaque because of its internal dust grains. These clouds have very low temperatures of just 10 to 30 kelvin and therefore the hydrogen is primarily composed of molecular hydrogen or H 2.Compared to the mainly ionized hydrogen in other areas of the interstellar medium, less than 1% of all hydrogen in the Milky Way is bound in molecular clouds. There is observed evidence that the large, star-forming clouds are confined to a large degree by their own gravity (like stars, planets, and galaxies) rather than by external pressure. Molecular hydrogen is difficult to detect by infrared and radio observations, so the molecule most often used to determine the presence of HWithin molecular clouds are regions with higher density, where much dust and many gas cores reside, called clumps. The present rate of star formation is about one solar mass per year in the entire Galaxy, which contains something like 2 × 10This cycling of gas through stars has had one major effect: the chemical The Orion Nebula, for example, is merely a conspicuous ionized region on the nearby face of a much larger dark cloud; the H II region is almost entirely produced by the ionization provided by a single hot star, one of… …are almost always accompanied by molecular clouds on their borders.

The evidence comes from the fact that the "turbulent" vel… Our editors will review what you’ve submitted and determine whether to revise the article.The hydrogen of these opaque dark clouds exists in the form of HIn the inner regions of molecular clouds an important event takes place: the formation of stars from the gravitational collapse of dense clumps within the These ideas are given encouraging confirmation by observations of molecular clouds in very long wavelength infrared radiation.



The Coalsack nebula, photographed from the International Space Station. In contrast, the gas pressure within the cool regions of the interstellar medium only need counter the gas pressure of the surrounding warm regions.

Dark nebulae appear as irregularly shaped black patches in the sky and blot out the light of the stars that lie beyond them. Categories 

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