What is Time? – Time and space in Physics
Time and space: a sundial from Ukraine (ca. 1300 BC) - one of the two oldest sundials in the world Are time and space the same thing? Nobody knows what [...]
19
08, 2017
19
08, 2017
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 [...]
17
08, 2017
Big bang – Space science – Physics
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 [...]
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 [...]
16
08, 2017
What is a photon? Physics of light
Photons - Sunshine breaking through the clouds. When did the first photons appear? A photon is a tiny little particle of light, far too small to see individually. All light is [...]
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 are quarks? Nuclear physics and science
What are quarks? Tiny particles found all over the universe. What are quarks? Quarks and electrons are the tiniest particles. There are three quarks in every proton and three in [...]
2
06, 2017
What is a proton? Atoms and Chemistry
Autzen Stadium, in Eugene Oregon, seats 54,000 people A proton is a tiny particle, smaller than an atom. Protons are too small to see, even with an electron microscope, but [...]
2
06, 2017
What is hydrogen? Atoms and Chemistry
A diagram of a hydrogen atom Hydrogen is the simplest kind of atom Hydrogen is the simplest kind of atom, and in the very earliest days after the Big Bang [...]