What is Dark Energy? | Learn About Universe

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Dark energy is a form of energy that gives the vacuum of space a non-zero density, acting as a counter to gravity. It is primarily responsible for the accelerated expansion of the universe, rather than just its expansion. This repulsive force plays a crucial role in cosmology, influencing the overall dynamics of the universe. Understanding dark energy is essential for comprehending the fate of the universe. The discussion emphasizes its significance in the context of cosmic acceleration.
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what is dark energy? i heard that when i was watching a Tv programme about space.
 
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Anything that gives vacuum a non-zero density can be called dark energy.
 
dark energy is supposed to be a counter to gravity, and it is supposed to cause the rapid expansion of the universe.
 
Some clarification on Nenad's post:

Dark energy is a repulsive force that is responsible not for the universe's expansion, but for the acceleration of its expansion.

- Warren
 

Thread 'The Physics of unloading sand from a barge'

I think it's easist first to watch a short vidio clip I find these videos very relaxing to watch .. I got to thinking is this being done in the most efficient way? The sand has to be suspended in the water to move it to the outlet ... The faster the water , the more turbulance and the sand stays suspended, so it seems to me the rule of thumb is the hose be aimed towards the outlet at all times .. Many times the workers hit the sand directly which will greatly reduce the water...
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