... Noctilucent Clouds over London . ... This scene from the early morning hours of July 3 looks out across the River Thames from the Westminster Bridge. ... Recently discovered exoplanet Gliese 832c has been found in a close orbit around a star that is less bright than our Sun. Iridescent Clouds over Thamserku . ... Why would a cloud appear to be different colors? A relatively rare phenomenon known as iridescent clouds can show unusual colors vividly or a whole spectrum of colors simultaneously. ...