There are three main types of astronomicaltelescopes - and these are divided into subgroups. They all have their different advantages and disadvantages and they are used in different areas of astronomy.
... the average family size is 2.77.
In the village the population is spread out with 17.4% under the age of 18, 3.5% from 18 to 24, 22.3% from 25 to 44, 28.7% from 45 to 64, ...