Calculations show that wormholes should create a spectacular display of gamma rays that we could try to observe.
Voyager 2 launched in 1977 and visited all four gas giants in our Solar System. It's now almost 18 billion kilometres from Earth and has finally joined its twin in interstellar space.
'Oumuamua is likely a relatively young interstellar visitor from a binary star system.
Scientists looking for signs of alien life from the mystery object passing through our Solar system say they've found nothing "so far".
Astronomers have detected what is believed to be the first interstellar object ever seen passing through our solar system.
The mystery object seen moving through our Solar system shows the void between the stars is far from empty. So can we expect more interstellar visitors?
It's like one great big distillery up there.