What is a nebula? Space and astronomy
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]
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 [...]