Man's physical universe

xanabras

74 THK UNIVKRSK A VAST SN'STKM OF PARTS

estimated to be from 6000 to 10,000 light-years from face to face, with

a diameter of about 100,000 light-years or less. The earth is located

inside this watch. When we look at the Milky Way we are looking

towards the edge and so see many more stars than when we look toward

either face of the watch.

The stars in our galaxy arc not evenly distributed.

Sometimes they

are grouped as star clouds like the star cluster in Hercules, which contains

at least 100,000 stars,

and probably more. This

is only one of several

hundred star clusters that

appear to be single stars

when viewed by the naked

eye but are shown to be

relatively dense clusters

when viewed with the tele-

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