Was Oumuamua a space probe?

Is 3I/ATLAS another?

If so, why haven’t they said hello?

The humble residents of this pale blue dot have been on a quest to find an alien civilisation for more than a century.

First, it was the “canals” of Mars .

Then there were enigmatic radio “lighthouses.”

And the famous “Wow” signal.

All have ended up with mundane and mechanical explanations.

“It stands to reason that the Universe should be buzzing with activity, but we’ve been searching for signals for decades and haven’t heard zip,” bemoans the Planetary Society’s Kate Howells.

One after another, theories about where and how technologically advanced interstellar civilizations can be found have fallen by the wayside.

But, as technology advances, the scope for this search broadens.

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