Do aliens exist? If they did, would we know?

We still don't have proof of intelligent life beyond that on Earth.

  • One of the biggest questions is whether we are alone in the universe — could there be other intelligent life, besides us, out there? Currently, we don't have any evidence aliens exist.
  • There may have been a chance for a civilization to start billions of years before life began on Earth — one that is far more advanced, technologically speaking, than us. However, they're not making it very obvious. We have no proof of this.
  • If such an advanced civilization exists, though, it probably relies on solar energy to fuels its everyday activities.

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Moon landing astronauts reveal they possibly infected Earth with space germs

Two Apollo 11 astronauts question NASA's planetary safety procedures.

Credit: Bettmann, Getty Images.
  • Buzz Aldrin and Michael Collins revealed that there were deficiencies in NASA's safety procedures following the Apollo 11 mission.
  • Moon landing astronauts were quarantined for 21 days.
  • Earth could be contaminated with lunar bacteria.
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Was 'Oumuamua​ an alien spaceship? No. Here’s what it is.

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  • Oumuamua, a quarter-mile long asteroid tumbling through space, is Hawaiian for "scout", or "the first of many".
  • It was given this name because it came from another solar system.
  • Some claimed 'Oumuamua was an alien technology, but there's no actual evidence for that.
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The government’s secret UFO reading list is revealed. Wow.

FOIA release sheds light on the DOD's own struggle to understand UFOs.

(Vladi333/SONY/Big Think)
  • A just-unclassified Department of Defense reading list on UFOs is stunning.
  • The DOD is wondering if the truth lies in some of the most far-out theories.
  • Science fiction has nothing on science fact.
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Top 5 messages sent to alien civilizations

Between Carl Sagan's laughter, the brainwaves of somebody in love, and a live theremin concert, humanity has sent a lot of data out into the stars.

ESA/Hubble & NASA
  • Ever since we've had the capability, humanity has been desperately trying to make contact with other life in the universe.
  • While we've been beaming out information passively through our television and radio broadcasts, we've also sent more intentional messages.
  • Looking at these messages tells us how humanity wants to think of itself and what kind of relationship we hope to have with alien life.
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