What do some people believe happened on Earth?, Aliens visited Earth., Dinosaurs returned., The Moon disappeared., Earth stopped moving., What does UFO stand for?, Universal Flying Object, United Flying Orbit, Unidentified Flying Object, Unknown Fast Object, Since when have many UFO sightings been reported?, The 1940s, The 1800s, The 1600s, The 2000s, What do scientists say about UFO sightings?, They are all alien spaceships., There is no clear proof they are aliens., They are all fake videos., They come from the Moon., Which of these can explain some UFO sightings?, Sea monsters, Aliens, Weather balloons, Magic, What galaxy is Earth in?, Andromeda, Whirlpool, Sombrero, The Milky Way, What is the question called if aliens may exist but we haven't found them?, Big Bang Theory, Zoo Theory, Fermi Paradox, Gravity Theory, What does the Zoo Hypothesis means?, Aliens don't want to contact humans., Aliens live in zoos., Aliens only visit animals., Aliens built Earth., According to many scientists, why haven't we found aliens?, Aliens don't like Earth., Space is very large., UFOs are invisible., Humans already know everything., How much of space have humans explored?, Half, Most of it, One quarter, Only a tiny part

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