In the vicinity of black holes, space is so warped that even light rays may curve around them several times. This phenomenon may enable us to see multiple versions of the same thing. While this has ...

Photons are odd little beasts. They can act like waves. They can act like particles. They are teeny tiny messengers of force. They are carriers of energy. If you're enjoying this article, consider ...

In Hubble pictures taken just months apart of V838 Monocerotis, the dust ring around this star grows by several light-years during that time, called a “light echo.” How can something grow by 5 ...