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What is a Comet? – Astronomy – Space

By |2018-05-31T11:49:16+00:00August 17th, 2017|Physics|

A comet in the night sky Comets are balls of leftover rock and ice in space. They started out when a star exploded into a supernova.  A nebula formed, and then most of the material in our nebula merged together, about 4.5 billion years ago.. But these balls didn't join up with our planets. Instead, the comets kept on circling around the Sun on their [...]

What is jade? Metamorphic rock

By |2018-04-21T12:09:20+00:00June 26th, 2017|History|

What is jade? Jade rock from Alaska Jadeite and nephrite Jade is really two kinds of metamorphic rock, jadeite and nephrite, that look pretty much exactly the same. Scientists can tell them apart using chemical tests and x-rays. Like quartz, both jadeite and nephrite are chains of silicon and oxygen atoms. Why is [...]