[Capitalism2003]

"Build a sphere around the entire sun? Do you realize how much mass that would require? Probably the total of several thousand planets depending on the circumference. Not gonna happen."

Everything is relative.
Haven't you seen Men in Black? ;)
Our entire galaxy is more insignificant than a single grain of sand in the grand scheme of things. The universe is 15 billion years old vs Earth's 5 billion years. Of the 5 billion years, man has only been around for a few thousand...There are potentially civilizations out there that had our technology 10 billion years ago...With this much evolution past, there really would be virtually no limit to what they are capable of.

[MHGinTN]

"There are potentially civilizations out there that had our technology 10 billion years ago ... " Not likely since it is the hydrogen based stars (in the beginning of star formation, that's all there were) that built the first larger elements and were dispersed throughout space, to later re-form as planets and moons, etc ... at least a several billion year exercise.

[dead]

Our entire galaxy is more insignificant than a single grain of sand in the grand scheme of things.

No, a single grain of sand is more insignificant in the grand scheme of things than our galaxy.

Our galaxy is exactly as insignificant as a galaxy in the grand scheme of things, which is not very significant.