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Astronomers have found a cluster of giant asteroids co-orbiting the Sun with Venus—space rocks that might become a long-term hazard for Earth. These are not ordinary asteroids. Sometimes referred to as city killers because of their size, many are bigger than 140 meters; they are big enough to wipe out a whole urban centre upon impact. More concerning is that they can be hidden from our telescopes by the Sun’s intense glare.These so-called co-orbital asteroids don’t move in orbit around Venus but follow similar orbits around the Sun. Out of the 20 discovered to date, there are “Trojan” asteroids, which stay either in front of or behind Venus in its orbit, and a quasi-moon called Zoozve. They are said to have originated from the main asteroid belt between Mars and Jupiter and were later drawn into Venus’s vicinity by gravitational forces.