Using the laser pointer to point

When using the laser pointer to point at the stars, it is important for astronomy enthusiasts not to use the pointer too often or for a long time, so as not to hinder others to see the stars and take pictures. For astronomical purposes, a 5000mW green laser is dangerous and could cause a plane crash. In crowded public places, in order to avoid accidental injuries, you should stop using green laser pointer. Some high-power products have strong thermal effect and cannot be used continuously for a long time, especially for temperature sensitive semiconductor lasers. When we buy laser Pointers, we have to go to a trusted company or store. Some irresponsible businessmen mislead customers for profit. We can't stop this, but we have to explain some facts. Generally speaking, we can achieve the output power of the water-cooled solid-state green laser is 5W, and the output power of the laser flashlight is 1.6W. But 30,000 MW (30W) doesn't exist!