> People seem to break it down into three potential categories: misinterpretted/bad data/not real, secret project carried out by other nation, or extraterrestrial craft. ... Extraterrestrial doesn't make sense, because of the difficulty in crossing interstellar distances.
We know there is plenty that we don't know. However, what is so devestatingly sad is that it seems pretty clear that no one living today will ever get a full understanding. Physics progressed pretty quickly in the early 20th century, but it's now moving at a glacial pace. If faster than light travel, wormholes, or multiple universes are real possibilities, it may very well take several thousand years for humans to decipher them.
We know there is plenty that we don't know. However, what is so devestatingly sad is that it seems pretty clear that no one living today will ever get a full understanding. Physics progressed pretty quickly in the early 20th century, but it's now moving at a glacial pace. If faster than light travel, wormholes, or multiple universes are real possibilities, it may very well take several thousand years for humans to decipher them.