The Arch of Ctesiphon, or the Iwan of Al-Madain, or Taq Khosrau, which is the largest arch in the world built of bricks without the use of pillars or reinforcement, is located near Baghdad. It was built in the sixth century AD, and is considered one of the wonders of architecture. Ctesiphon was an ancient city and trade center on the east bank of the Tigris River founded during the reign of Mithridates I (the Great, 171-132 BCE). It is best known in the modern day for the single-span arch, Taq Kasra, which is the most impressive aspect of the city's ruins. It was the capital of the Parthian Empire (247 BCE - 224 CE) before being destroyed by Rome and was then restored to become capital again of the Sassanian Empire (224-651 CE). The Sassanian king Ardashir I (r. 224-240 CE) rebuilt the city and was crowned there, as his successors would be also.
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Meteorite with CAIs: oldest known solid material in our solar system- the white substance in this meteorite is called Calcium Aluminum rich inclusions (CAIs) and radiometric dating sets the formation time at 4.5673 billion years ago- a few million years older than the rest of the meteorite material and thought to be the first solid compounds formed in the protoplanetary disk before the planets even existed. This substance is most common in carbonaceous chondrites type CV3 as found in this 8 gram sample which was cut and polished on one side. This particular sample was found in 2012 in Northwest Africa. Only the molecules and atoms themselves are older than this CAI material! ➡️ Follow the link in my profile for info on where to get a chunk of meteorite with CAIs and many other amazing items featured here on @physicsfun#meteorite#carbonaceous#chondrite#CAIs#oldestmaterial#deeptime#physics#physicstoy#astronomy#astrophysics#physicsfun#geophysics#geophysicstoy#solarsystem#radiometricdating#inclusion#oldestrock#rockhound#ancient#mineral#geology#science#scienceisawesome