What makes sound? Simple physics
Playing a French horn makes sounds because you blow into it and that moves the air Like light, sound travels through the air in waves, but unlike light, sound is not [...]
17
08, 2017
17
08, 2017
Nuclear fusion – Simple Physics
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 [...]
17
08, 2017
Newton’s Laws of Motion – Movement – Physics
Light takes years to reach us from these stars far away in space. When solid objects move through space, they follow certain rules that let us predict how they will act. We call [...]
16
08, 2017
What is a light-year? Physics definitions
Light takes years to reach us from these stars far away in space. What is a light-year? A light-year is the distance that light can travel in one year - [...]
2
06, 2017
What is water made of? Molecules and chemistry
A big ocean wave The first molecules of water formed out in space, about 14 billion years ago, as part of the nebula left over after an early star exploded [...]
2
06, 2017
What is a neutron? Atoms and Chemistry
A neutron star (from NASA) A neutron is a tiny particle like a proton, smaller than an atom. Like protons, neutrons are too small to see, even with an electron [...]
2
06, 2017
Ice, water, and simple chemistry
Ice chemistry: Perito Moreno glacier, Argentina (thanks to Argentina's Travel Guide) How water freezes into ice When water gets colder than 32 degrees Fahrenheit or zero degrees Celsius, it freezes [...]
2
06, 2017
What are hydrocarbons? Simple chemistry
A model of a methane molecule - the simplest of hydrocarbons A kind of molecule Hydrocarbons are molecules. They are made out of hydrogen atoms and carbon atoms. Methane is [...]
2
06, 2017
What is heat? Simple science – Chemistry
What is heat? A big campfire throws some serious heat Definition of heat When molecules of any kind of atoms get more energy in them than they had before, they [...]
29
05, 2017
Natural Selection – Evolution and Biology
The feet of a person with six toes on each foot Whenever protons and electrons bump into each other, or atoms bump into each other, or molecules bump into each other, [...]
