If Aliens Visited Our Solar System, Will We Ever Know?

• Have intelligent aliens ever visited the solar system? 
• The solar system has been around for over 4 billion years, and if intelligent life arose in our galaxy, it may have reached us.
• Scientists have outlined how we can look for clues any visitors may have left behind.

If aliens have visited the solar system, here’s how to find clues they left.

There are several main methods for hunting for intelligence outside Earth. The first approach is to look for signs of any...

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