atoms

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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

What is mass? Physics

By |2018-05-31T11:49:29-07:00August 18th, 2017|Physics|1 Comment

This truck has a lot of mass. Mass is a measure of the number of atoms in an object combined with the density of those atoms. Usually people measure mass in kilograms. You can tell how much mass something has by measuring how hard it is to get that thing to change directions or slow down. If you're driving a [...]

17 08, 2017

Brown dwarf stars – Space science

By |2019-02-24T19:58:01-07:00August 17th, 2017|Physics|0 Comments

What a brown dwarf might look like up close What is a brown dwarf star? The very beginning of a star forming is a brown dwarf: a star that hasn't gotten enough mass together yet to begin nuclear fusion. More about nuclear fusion Different types of stars What are stars made of? All our physics articles [...]

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

Radioactivity and nuclear physics

By |2018-04-24T14:44:18-07:00August 17th, 2017|Physics|0 Comments

A Japanese girl who lost her hair from radiation sickness from the atomic bomb Americans dropped on Hiroshima Some atoms are naturally radioactive, especially atoms of uranium and plutonium. These atoms have so many protons and neutrons that even the strong nuclear force is barely strong enough to hold them together, and they sometimes lose a proton or a [...]

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

Nuclear fusion – Simple Physics

By |2019-06-29T08:35:35-07:00August 17th, 2017|Physics|0 Comments

The Sun shining from space: nuclear fusion in action. The first fusion reactions Fusion reactions are how the first stars got started. Soon after the Big Bang, hydrogen atoms began bumping into each other and merging into one bigger helium atom. Four atoms with four nuclei - centers - mixed together into one atom with a bigger nucleus. What's [...]

17 08, 2017

Nuclear fission project – Physics

By |2018-05-31T11:49:25-07:00August 17th, 2017|Physics|0 Comments

Make a bunch of paper balls One atom of uranium has 92 protons and about 145 neutrons in its nucleus. So make 92 small balls of paper... no, that would be too hard. Make a bunch of small balls, the size of the tip of your finger, by crumpling up scraps of paper. You should [...]

16 08, 2017

What is electricity? Physics

By |2019-05-27T06:51:27-07:00August 16th, 2017|Physics|0 Comments

What is electricity? A bolt of lightning in the sky What is electricity made of? Everything in the universe is made of atoms.  Those atoms are made of electricity. Atoms are made of even smaller particles called protons, neutrons, and electrons. Electricity is electrons that have gotten loose from their atom. More about electrons History of electricity What [...]

7 08, 2017

European science in the 1800s

By |2019-09-17T11:37:45-07:00August 7th, 2017|Modern Europe|2 Comments

European boys at school in the 1800s More schools and more scientists In the first half of the 1800s AD, countries in northern Europe like France and Britain forced other countries to give them food. European armies conquered India, Ghana, Nigeria, Canada, and other places. Europe made those places poorer while Europe got richer. Enlightenment science Colonization and empire African-American [...]