21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 15, Problem 26QP
To determine

The reason for the cloud does not collapse when it becomes a single massive object.

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As a cluster of stars begins to age, which type of star in the cluster will move off the main sequence of the H-R diagram first?   1) all the stars in a cluster are born at the same time; so they will all move off the main sequence at the same time, as they evolve   2) G type stars, like our Sun   3) M type stars, which are the coolest   4) the lowest mass stars, which have the least amount of fuel for fusion   5) the O and B type stars
A planetary nebula expanded in radius 0.3 arc seconds in 30 years.  Doppler measurements show the nebula is expanding at a rate of 35 km/s.  How far away is the nebula in parsecs? First, determine what distance the nebular expanded in parsecs during the time mentioned.  Δd = vpc/sTs So we first need to convert the rate into pc/s and the time into seconds: vpc/s = vkm/s (1 pc / 3.09 x 1013km) vpc/s = ? Ts = (Tyr)(365 days/yr)(24 hrs/day)(3600 s/hr) Ts = ? s Δd= vpc/sTs Therefore, Δd = ? pc
When a region of a molecular cloud collapses, a protostar is formed. How do the temperature and density change as a protostar gets smaller and smaller? Group of answer choices The temperature decreases and the density decreases. The temperature decreases and the density increases. The temperature increases and the density decreases. The temperature increases and the density increases.
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