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Creation and the Jewish Bible

By |2017-08-23T21:56:08+00:00August 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 |2018-05-31T11:49:31+00:00August 19th, 2017|Physics|

Supernova from space (thanks to NASA and the Hubble Telescope) What is a supernova? 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. A red giant star explodes Red giant stars have a lot of gravity pulling them inward. Normally they don't collapse inward because the nuclear [...]

What are stars made of? Astronomy, physics

By |2018-05-31T11:49:32+00:00August 19th, 2017|Physics|

What are stars made of? This is just one of the stars: the sun from space The first stars 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. (More [...]

What is a nebula? Space and astronomy

By |2018-05-31T11:49:30+00:00August 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 |2018-05-31T11:49:32+00:00August 18th, 2017|Physics|

Main sequence stars: A starry sky with the Milky Way galaxy (thanks to Bernd Nies) What is a main sequence star? Nine out of ten stars that you see in the sky are main-sequence stars, and our sun is one of them. (More about the sun) Most main-sequence stars probably started out as brown dwarfs, and then succeeded [...]

Galaxies – Astronomy – Space science

By |2018-05-31T11:49:27+00:00August 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 |2018-04-24T14:22:12+00:00August 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 |2018-04-24T11:58:42+00:00August 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 [...]