A project searching for intelligent life in the cosmos is going to check the first known interstellar asteroid for signs of alien technology.
The odd-shaped object was detected as it sped towards the Sun on 19 October.
Its properties suggested it originated around another star, making it the first such body to be spotted in our cosmic neighbourhood.
An initiative backed by billionaire Yuri Milner will use a radio telescope to listen for signals from it.
The team's efforts will begin on Wednesday, with astronomers observing the asteroid, which is currently speeding away from our Solar System, across four different radio frequency bands.
The first set of observations at the Robert C Byrd Green Bank Telescope in West Virginia is due to last for 10 hours.
Previous observations of the object, called 'Oumuamua, have noted its strange, elongated shape, making it look a bit like a cigar.
Although 'Oumuamua formed around another star, scientists think it could have been wandering through the Milky Way, unattached to any star system, for hundreds of millions of years before its chance encounter with our Solar System.
The asteroid's name, 'Oumuamua, means "a messenger from afar arriving first" in Hawaiian, reports BBC.