There are the puffy cotton ball-like clouds against the blue sky — those iconic cumulus ... for cloud watching — the window seat on an airplane. From a plane, clouds look like something ...

If you’ve ever looked up at a mostly blue sky and seen straight white lines criss-crossing the horizon, or watched a plane puff out ... contrail is an artificial cloud,” says Steven Barrett ...

These wispy man-made clouds have fascinated humans ... "[N]ever before had I seen a plane writing in white upon the blue slate of sky," he added. During the Second World War, militaries tried ...

If there are no contrails or clouds surrounding it, the plane is moving against a completely uniform blue sky. This can make it very hard to perceive just how fast a plane is moving. And because the ...

I head up a hill to a lookout spot from which I can survey the sky ... a cloud of condensation. NASA lists three types of contrails: short-lived ones that form directly behind planes as they ...

If there are no contrails or clouds surrounding it, the plane is moving against a completely uniform blue sky. This can make it very hard to perceive just how fast a plane is moving. And because ...