Coloring page, depicting two Christmas candles. Until colored electric lights became common, Christmas candles were often used to light Christmas trees, and they are still used to decorate tables and fireplace mantels.
Crystal chandeliers use glass and crystal prisms to reflect light for a dramatic effect. This photo of a large crystal chandelier with lots of candles on a black background showcases the type of crystal chandelier that is often used in theaters.
The luminosity of an astronomical object, if known, can be used to measure vast distances in space. A particular type of gamma ray burst could be applied in this way, according to an EU-funded project. ...
European Commission. Wed, 12 Jun 2019 00:00:00 GMT.