"Present-day Earth, it can be confidently said, is as much our ethical proving ground as it is our pragmatic launching pad."
Astrophysics, future studies, history, and philosophy meld in this discussion of "Great Filters"—the obstacles or calamities that prevent civilizations from reaching advanced technological states, and in particular, the "technological progress necessary to make contact across interstellar distances." The authors emphasize that the ethical concerns accompanying technological progress are also crucial to mankind's evolution.
Some readers may wonder why interstellar travel and extraterrestrial contact are considered guideposts in humanity's present and future development, especially given the vast energy needs that our species has yet to harness. Other readers will likely infer that curiosity, a desire for connection, and sometimes even survival needs drive both terrestrial and extraterrestrial exploration. If Earth were openly, verifiably contacted by an advanced civilization, it is obvious how profoundly life-changing this event would be . . .