Cloud seeding is an 80-year-old practice for the promotion of rainfall, where airplanes fly up into the ... so there's not a great way to make a control group for any study. It's also hard to ...

One recent day, I walked to my perch and watched a plane make its way west ... Some people enjoy watching clouds, but I prefer contrails, those chalky lines left in the wake of aircraft at ...

What are those long, white clouds a plane leaves behind ... a camouflage effect that shields the plane. That, combined with stealth technologies, could make an aircraft invisible to radar.

Planes or drones inject particles into the ... “The whole idea is not ‘creating clouds’ – because we cannot make a cloud, we cannot chase away a cloud,” Bruintjes said.

Cirrus clouds are found high in the atmosphere where most jet planes fly, between 20,000 and ... These clouds typically emerge several days before a rain-making system of low atmospheric pressure ...