This could be through a variety of ways including radio signals and flashes of light.
Because humans are creating more technology produced noise than ever, we are undermining our ability to detect potential alien transmission.
SETI – Search for Extraterrestrial Intelligence – scientists say that we are actually making that much noise, that if aliens tried to phone us, we might never get the message.
A Harvard astronomer called Abraham Loeb believes that the object, named Oumuamua, was actually a spacecraft sending signals back to its creators.
Despite their efforts to scan the surface of the asteroid proved unsuccessful, the new study suggests that it could be an alien spacecraft.