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Different types of stars – Astronomy – Space

By |2018-05-31T11:49:31+00:00August 19th, 2017|Physics|

The Eagle Nebula Stars don't last forever, though they do last for billions of years. And they don't stay the same throughout their existence - they change over time. The earliest beginning of a star is called a nebula. A nebula is a cloud of hydrogen and a few helium atoms hanging in space. Sometimes a nebula just [...]

What is oxygen? Atoms, elements, chemistry

By |2018-04-24T14:46:22+00:00June 2nd, 2017|Chemistry|

Diagram of an oxygen atom When a star has changed all of its hydrogen atoms into helium, it turns into a red giant and moves on to convert the helium atoms into carbon atoms and oxygen atoms. All of the oxygen in the universe starts out inside stars. Then when all the helium is used up, [...]