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Creation and the Jewish Bible

By | 2017-08-23T21:56:08+00:00 August 23rd, 2017|Religion, West Asia|

God creates the Sun and the Moon, in a medieval European painting Many of the Jewish people in West Asia believed that at the beginning of time God created order out of Chaos. This is what is written in the beginning of the Bible, in the book called Genesis. Jewish ideas about the beginning of the [...]

Supernova – Space – Astronomy

By | 2017-08-19T09:23:22+00:00 August 19th, 2017|Physics|

Supernova from space (thanks to NASA and the Hubble Telescope) Supernovas are exploding stars. Red giant stars explode when they have used up their hydrogen and helium fuel, and converted most of their atoms to iron atoms. Red giant stars have a lot of gravity pulling them inward. Normally they don't collapse inward because the nuclear fusion going on inside them pushes energy outward. That [...]

What are stars made of? Astronomy, physics

By | 2017-10-14T16:41:05+00:00 August 19th, 2017|Physics|

The sun from space The earliest stars probably formed only a few hundred thousand years after the Big Bang that started the universe - maybe about 13.5 billion years ago. Stars are the oldest big objects in the Universe. Stars formed big clumps of hydrogen and a few helium atoms, the simplest kinds of atoms, and [...]

What is a nebula? Space and astronomy

By | 2017-08-19T01:15:01+00:00 August 19th, 2017|Physics|

The Eagle Nebula A nebula is a bunch of atoms and molecules floating in outer space, like a cloud of dust. More than one nebula are called nebulae, because -ae is the plural ending in Latin, just as -s is the plural ending in English. Nebula is the Latin word for a cloud. The earliest nebulae formed just [...]

Main sequence stars – Astronomy

By | 2017-08-18T17:56:46+00:00 August 18th, 2017|Physics|

A starry sky with the Milky Way galaxy(thanks to Bernd Nies) Nine out of ten stars that you see in the sky are main-sequence stars, and our sun is one of them. Most main-sequence stars probably started out as brown dwarfs, and then succeeded in getting enough mass together to begin a nuclear fusion reaction inside them. It's the energy from this [...]

Galaxies – Astronomy – Space science

By | 2017-08-18T16:28:55+00:00 August 18th, 2017|Physics|

The galaxy M 100, seen through the Hubble telescope A galaxy is a group of millions of stars that are relatively near each other. Most stars seem to be in one or another galaxy. Earth's own star, the Sun, is in the Milky Way galaxy. Small galaxies have about ten million stars, while big galaxies sometimes have [...]

Big bang – Space science – Physics

By | 2017-10-14T15:13:30+00:00 August 17th, 2017|Physics, When|

Inside stars (like our Sun) there are fusion reactions. Stars got started after the Big Bang. The Big Bang was the very beginning of our Universe, and it probably happened about 13.73 billion years ago, because that's how old the oldest stars are, and we think that stars began to form almost immediately after the Big Bang. Nobody [...]

Nuclear physics – fission and fusion

By | 2017-08-17T17:00:35+00:00 August 17th, 2017|Physics|

Atomic bomb explosions make a "mushroom cloud" - this is a fission reaction Nuclear physics is the process of getting energy from the nucleus of an atom. There are two ways to release energy from atoms: fission and fusion. Fusion happens all the time in nature, mostly inside stars because fusion needs lots of heat or gravity to get it going. Fusion works with the [...]