What does the acronym 'UFO' stand for?

• Unknown Flying Opportunity
• Unidentified Flying Object
• Universal Flight Orbiter
• Ultimate Free Orbit

Earth is located in the central part of the universe.

What is the term used for alien life forms, as mentioned in the passage? (Hint: It's a two-letter abbreviation.)

• E.T.

• ET

• et

Why do some people believe it's likely there is life outside Earth?

• Because Earth is the only planet near the sun
• Because there are many stars and planets in the universe
• Because aliens have been found
• Because scientists have already met aliens