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.

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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  • 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.

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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