Scientists from MIPT conducted a training nuclear attack on asteroids
Scientists used a laser as an imitation of a nuclear strike because it is impossible to conduct tests with a real nuclear weapon and a real meteorite. So, they created small copies of asteroids, only a few millimetres in diameter, and irradiated them with a laser. The power of the laser radiation for a small asteroid corresponded to the power of a nuclear explosion for a real asteroid, which could be hundreds and thousands of metres in size.
Scientists have found that to destroy a dangerous asteroid of up to 200 metres in diameter a power of about three megatons would be needed, i.e. it would be sufficient to use the power of currently available nuclear weapons. Although to destroy larger asteroids larger charges would be needed — more powerful than those that are currently in service.