The use of (green) laserpointer for astronomical use can be a dangerous. Last week an amateur astronomer was using a cheap green laserpointer and pointing to the night sky when F-16 Fighting Falcon Jets flew around. The pilotes were "blinded" by the laserbeam and police was informed. The police could trace the beam and the laserpen was taken in custody. Furthermore a formal report was made against the astronomer, risking up to 20 years jail in theory because of "obstruction of air traffic"
