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23 08, 2017

Creation and the Jewish Bible

By |2019-04-27T16:25:38-07:00August 23rd, 2017|Religion, West Asia|0 Comments

God creates the Sun and the Moon, in a medieval European painting God creates order from Chaos 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. What is [...]

19 08, 2017

Supernova – Space – Astronomy

By |2018-05-31T11:49:31-07:00August 19th, 2017|Physics|0 Comments

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 [...]

19 08, 2017

What are stars made of? Astronomy, physics

By |2018-05-31T11:49:32-07:00August 19th, 2017|Physics|0 Comments

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 [...]

19 08, 2017

What is a nebula? Space and astronomy

By |2018-05-31T11:49:30-07:00August 19th, 2017|Physics|0 Comments

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 [...]

18 08, 2017

Main sequence stars – Astronomy

By |2018-05-31T11:49:32-07:00August 18th, 2017|Physics|0 Comments

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 [...]

18 08, 2017

Space – Astronomy – Physics

By |2018-05-31T11:49:23-07:00August 18th, 2017|Physics|0 Comments

Lyrid meteor shower - Space Most of the universe is just emptiness - there is nothing there at all. It's dark. That's space. But within the space there is a small amount of stuff. Most of the small amount of stuff in the universe is loose electrons. When the universe first got started, just [...]

18 08, 2017

What is a galaxy? – Astronomy – Space science

By |2019-06-29T09:19:08-07:00August 18th, 2017|Physics|0 Comments

The galaxy M 100, seen through the Hubble telescope What is a galaxy? 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. What is the sun made of? What are [...]

17 08, 2017

Big bang – Space science – Physics

By |2019-02-13T20:55:59-07:00August 17th, 2017|Physics, When|0 Comments

Inside stars (like our Sun) there are fusion reactions. Stars got started after the Big Bang. What was 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 [...]

17 08, 2017

Nuclear physics – fission and fusion

By |2018-04-24T11:58:42-07:00August 17th, 2017|Physics|0 Comments

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 [...]

17 08, 2017

Acceleration – Physics definitions

By |2018-05-31T11:49:28-07:00August 17th, 2017|Physics|2 Comments

Pedaling will make her accelerate. So will going downhill. Acceleration is a way to measure how fast something is speeding up. Suppose you are riding your bike. You start out going very slowly, hardly pedaling at all. Now you begin to pedal as hard as you can, to speed up - you are [...]