Size is the most important consideration when choosing a telescope because it indicates the
light-gathering ability and what you'll be able to see. Size refers to the diameter of the main mirror
While any telescope will allow you to view the moon and brighter targets like Jupiter and Saturn, a larger one will
make it easier to also view DSOs (deep space objects) like galaxies, nebulas and star clusters. There are
thousands of these and, the larger the telescope, the better they will appear.
So the bigger the telescope the better, right? YES -- but only up to a point because larger telescopes are
also bulkier and heavier making them harder to manage.
We recommend a 3" (80mm) to 6" (150mm) telescope for children because these are large enough to reveal many
DSOs but certain ones are still small enough to be managed by children.