Curiosity, a set of NASA 's robotic "eyes" on the Red Planet, recorded 16 minutes of so-called noctilucent clouds flying ...

They can look similar to bubbles in soap or oil over water that give a rainbow appearance. They also have a similar appearance to the rainbow observed on a mother-of-pearl gemstone. Sign up for our ...

If you buy through a BGR link, we may earn an affiliate commission, helping support our expert product labs. Photographers have captured breathtaking photos of “rainbow clouds” shining in the ...