The Universe Might Be Full of Dead Civilizations

#insanecuriosity #ancientcivilizations
Humanity has been broadcasting radio signals into space for only about 100 years.
On the timescale of the universe, that is almost nothing.
So what if alien civilizations are not separated from us mainly by distance — but by time?
A civilization could rise, develop technology, transmit signals for thousands of years and disappear millions or billions of years before another civilization ever begins listening. The Milky Way could contain worlds where intelligence once existed, while leaving almost nothing we could recognize from Earth today.

In this documentary, we explore one of the strangest solutions to the apparent silence of the universe.

We look at the tiny technological window humanity occupies, the Drake Equation, the search for extraterrestrial intelligence, what SETI has actually searched so far, why our own radio leakage would be surprisingly difficult to detect, and how enormous communication delays make contact even harder.

We also look at Mars and Venus — two nearby examples of how dramatically a planet can change and ask what traces an advanced civilization might leave millions of years after it disappeared.

Would cities remain?

Satellites?

Artificial chemicals buried in rock?

Or could a planet that once hosted a civilization eventually look almost identical to one that never had life at all?

The universe may be silent because nobody is there.

But it could also be silent because we arrived at the wrong time.
#universe, #perfect universe, #galaxy #Mysteries