"The nature of the luminous cloud occasionally left glowing in the wake of large meteors and called the "persistent" streak or train has long been regarded... > Lire la suite
"The nature of the luminous cloud occasionally left glowing in the wake of large meteors and called the "persistent" streak or train has long been regarded as a mystery by astronomers. Many of these trains have been observed which have remained visible to the naked eye for quite as long as fifteen or thirty minutes after the disappearance of the burning meteorite itself. ..."