Astronomy Picture of the Day . A Perseid Meteor . ... Grains of cosmic sand and gravel shed from Comet Swift-Tuttle will streak across the sky as they vaporize during entry into Earth's atmosphere . ... In a clear dark sky, an observer might see a meteor a minute near peak times , but this year a bright moon will overwhelm the glow from many perseid meteors until moonset in the early morning hours. ... Publications with keywords: meteor - Perseids . Publications with words: meteor - Perseids . ...