In this illustration we show only what astronomers call our local group of galaxies,
leaving out all others. There is a general tendency of galaxies to gather in
groups, some not numerous, others several hundred or even a thousand strong.
How many must be reckoned to belong to our local group it is not possible to
say; at these stupendous distances, it is no longer possible to obtain very precise
data. It is certain that our local group includes the galaxies numbered 1,
2, and 3 in the previous drawing, and also, in the above illustration, the great
spiral in Andromeda called Messier 31 (6) with its companions NGC 147 (7) and
NGC 185 (8) and the spiral system Messier 33 in the constellation Triangulum
(9). Other galaxies which are usually considered to belong are those numbered
4 and 5 on the previous page and the systems NGC 6822 (10) and IC 1613 (1 1).
1 cm. in picture = 1024 cm. = about 1 million light-years. ||Scale = 1:1024|