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What are planets? Astronomy – Space science

By |2018-09-10T17:46:23+00:00August 19th, 2017|Physics|

What are planets? The planet Venus from space Before there were planets For several hundred million years after the Big Bang, there were no planets, only stars. Planets couldn't form until the first stars ran out of fuel and exploded into supernovas, about 14 billion years ago. The supernovas spewed out thousands of tons of carbon, oxygen, iron and other elements into space. Planets [...]

Mercury – Planets – Astronomy

By |2018-05-31T11:49:17+00:00August 18th, 2017|Physics|

Mercury from space Mercury is the closest planet to our Sun. At some parts of its orbit, Mercury is only about 46 million kilometers away from the sun. Because Mercury is so close to the sun, it is very hot there. It is so hot that all the carbon dioxide and oxygen has boiled away, and Mercury has very little [...]

Who is Hermes? Ancient Greek god

By |2018-04-23T08:41:56+00:00July 13th, 2017|Greeks, Religion|

This statue by Praxiteles shows Hermes playing with the infant Dionysos(300s BC) Hermes is a god of boundaries, borders and edges. Because of this, he's also in charge of things that cross borders, like messages or travelers. He is the messenger of the Greek gods; his father, Zeus, often sends Hermes to earth when [...]

Science in ancient and medieval China

By |2018-05-28T00:10:52+00:00June 7th, 2017|China, Science|

Chinese science: a double-action piston box bellows (China) What are some Chinese inventions? Chinese scientists started inventing a lot of new things around 500 BC, during the Warring States period. That might be because of the formation of the first empires and the rise of the Silk Road. (More about the Silk Road) [...]

What is water made of? Molecules and chemistry

By |2017-06-02T18:02:44+00:00June 2nd, 2017|Chemistry|

A big ocean wave The first molecules of water formed out in space, about 14 billion years ago, as part of the nebula left over after an early star exploded in a supernova. There were a lot of hydrogen and oxygen atoms floating around in these nebulae, and when they stuck together that [...]

What is mercury? Atoms, elements, chemistry

By |2017-06-02T10:00:50+00:00June 2nd, 2017|Chemistry|

Diagram of a mercury atom. Thanks to Open Door for this image Along with gold, lead, and uranium, mercury is one of the heavier kinds of atoms. Every atom of mercury has 80 protons and 121 neutrons in its nucleus. Like those atoms, all mercury atoms are made inside older stars that have [...]

Playing with Mercury video – Chemistry Projects

By |2018-04-16T17:42:56+00:00June 1st, 2017|Chemistry|

Unfortunately, you should not play around with mercury because it can be poisonous. It's hard to get these days anyway, now that they don't sell mercury fever thermometers anymore. But you can watch other people playing around with mercury in this video:   A video of people playing around with liquid mercury, or quicksilver Does [...]