Why are the colors of the rainbow visible at sunset? In: Physics
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For anyone that doesn’t know, and I hope I’m not relaying incorrect information, a regular voltaic battery like a Duracell or Energizer has a negatively charged end where electricity flows through the device it’s being used for, powering the device, ...
why can you only feel air (like fanning yourself or the wind) when speed is involved? In: Physics
How can astronomers tell how ‘old’ light is? In other words, how can they tell if they are looking at an object 10 light years away or 1009 light years? In: Physics
What causes Tsunami waves to retreat back into the ocean? What force is pulling the ocean waves miles out to sea and and pushing it miles in-land? In: Physics
How does a storm sustain winds? Where does the energy to sustain hours of wind come from? In: Physics
Taal volcano from ThatsInsane In: Physics
[Nasa.gov](https://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy) explains dark energy like a property of space, and go on to say: > Albert Einstein was the first person to realize that empty space is not nothing. (…) The first property that Einstein discovered is that it is ...
if all motion is relative, how do we know the Earth isn’t stationary with everything else in the Universe rotating around us, albeit in a right weird and in uniform way. In: Physics
Eli5: How do we know how old the universe is? In: Physics