Helium: A colorless, inert gaseous element that is a trace constituent of the atmosphere, amounting to only 0.000524 percent by volume of dry air. Its existence on the sun was recognized before its ...

Krypton: An inert gaseous element that is a trace constituent of the atmosphere, amounting to only 0.000114% by volume of dry air. Hundreds protest Musk at Libertyville Tesla dealership: ‘What Elon ...

Everything we can see and touch, and quite a lot that we can’t as well, is made of tiny particles called atoms. Some substances, like particles of this iron, contain only one kind of atom. Iron is an ...

Billions of years ago, before the Earth was formed, what later became our solar system was made up of dynamic, gaseous elements from a massive supernova. In other words, supernova remnants, what's ...