How large is the observable universe according to the video?, About 90 billion light-years, About 90 million light-years, What important question did the physicist ask?, “How old is Earth?”, “Where is everybody?”, Why is it surprising that we have not found aliens?, There are many galaxies, stars and planets., There are only a few planets in the universe., What is the Great Filter?, A difficult obstacle that life may not overcome, A machine used to find UFOs, What do technological barriers make difficult?, Travelling between stars, Travelling between countries, What does the zoo hypothesis suggest?, Advanced aliens may be watching us without making contact., Aliens may be living in zoos on Earth., What may cause an advanced civilization to destroy itself?, Too much space travel, War and environmental damage, Why might we not have found aliens yet?, Scientists have stopped studying space., We may not have searched enough., What kind of signals have scientists mainly searched for?, Radio signals, Music signals, What was the one identified object in the UFO report?, An alien spaceship, A large deflating balloon
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