
Concept explainers
Part a
Location of the following constellations having globular clusters relative to Milky Way’s disk and its galactic centre, i.e. constellation Sagittarius: Aquarius, Aquila, Canes Venatici, Capricornous, Carina, Centaurus, Columba, Coma Berenices, Hercules, Hydra, Lepus, Lynx, Lyra, musca, ophiuchus, Pegasus, Puppis, Sagittarius, Scorpius, Sculptor, Serpens, Tucana and Vela.
Part b
Location of the following constellations having young open clusters (age less than 100 million years) relative to Milky Way’s disk and its galactic centre, i.e. constellation Sagittarius: Canis Major, Carina, Cassiopeia, Crux, Cygnus, Monoceros, Norma, Ophiuchus, Perseus, Puppis, Sagittarius, Scorpius, Scutum, Serpens, Taurus, and Vela.
Part c
Comparison of the locations of the two sets of clusters and description of differences.
Part d
An explanation about the observed differences in part (c).
Part e
An alternative explanation about the observed differences in part (c).
Part f
To Discuss:
Parts (d) and (e) and enlistment of astronomers’ observation for determining the better explanation

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Chapter 15 Solutions
The Essential Cosmic Perspective (7th Edition) - Standalone book
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