Astronomers track Chelyabinsk meteor's orbit and find 20 more on a similar path The spectacular fireball over Russia in February sent shock waves around the world: Twice, to be exact. The 11,000 tonne rock the size of a house speared through the atmosphere at 64,000km/h before it detonated above a remote Russian ice lake near the city of Chelyabinsk: shattering windows and injuring more than 1000 people. The asteroid had avoided detection as it had approached from within the sun's glare. Astronomers have since been working hard to find out where it came from and whether or not there were any other "killer rocks" following a similar path. A recent report in the journal Monthly Notices of the Royal Astronomical Society says 20 have now been found. Spanish astronomers tracked the angle of the smoke trail left in the atmosphere by the 18 metre wide bundle of interstellar rubble to work out its most probable trajectory. A meteor streaked across the sky of Russia's Ural Mountains, causing sharp explosions and reportedly injuring around 1000 people, including many hurt by broken glass. Picture: AP /Chelyabinsk.ru Source: AP After running billions of possible computations on what it would take to produce such a collision, they used an average of the 10 most likely orbits to find out where similar projectiles could be. The 20 objects range in size from 5m to 200m. It is speculated the asteroids come from a larger body which fragmented some time in past 30,000 years. The next piece is expected to fly-by Earth in 2025. ``Unfortunately, the current orbits of all the candidates are not reliable enough to claim a conclusive connection although the available evidence is certainly encouraging," the researchers said. The biggest of the asteroids is 2011 EO40 which frequently loops through the orbits of Mars, Venus and Earth. The 200m large object follows an orbit very similar to that attributed to the Chelyabinsk meteor. The meteor flies over Russia near the small city of Chelyabinsk in February this year Source: Supplied