🚀 go-pugleaf

It seems that people prefer refractors for viewing the planets, but are
willing to use a telescope with an obstruction (e.g. Newtonians) in
order to gain aperture when viewing far away objects.

1.  Why is this?

2.  What do people prefer to look through when viewing large far away
    objects (nebulae)?  Why?

3.  Could a reflecting telescope without an obstruction be as good as a
    refractor?

4.  Is it practical (possible?) to build a parabolic mirror
    that is not centered around the trough of the parabola (so that the
    primary's focal point is not directly over the mirror)?

5.  How is this idea related to the idea of using an aperture stop?

I don't know much about optics or telescopes, so keep it simple.

Thanks,

Paul Butler