nlerd writes:
So far as I understand God created all that exists for man (am I wrong in that assumption?), if that is the case then why is the universe so vast? Seems to be a huge waste of space seeing as how man's purpose (whatever that is) should be achievable on Earth. Maybe God has other projects going on in other parts of the universe?
The heavens declare the glory of God - which, depending on your outlook, will manifest in a couple of ways.
In the believers case, God is known to exist and is in part understood and appreciated through what he has created (personally, tiny insects do it for me given that I'm a mechanical engineer with an particular appreciation for the fantastic mechanics/electrics/software involved in such creatures).
The vastness of the heavens (or intricacy of the microscopic) point to the majesty and scale of God. He is the engineers engineer, the poets poet, the mathematicians mathematician. Presumably he has made them as vast as they are in order that they will produce that same effect in believers no matter how far into the cosmos they advance.
In the unbelievers case, the vastness of the universe is intended to cause awe, humility and not a little discomfort to well up*. Pondering on the heavens (or the vast seas, or the micro world) highlights the apparent insignificance of man and brings it into conflict with that in man which knows he is very significant indeed. This, as part of the mechanism of God intended to cause men to turn back to him. The purpose of such lavish scale is as before: no matter how far men progress, there is only more to wonder about.
*suppressible of course.
Edited by iano, : No reason given.