Unveiling the Mystery of Dark Energy

AI Thread Summary
Dark energy is a term used in cosmology to describe a constant energy density in the universe, despite galaxies moving apart. Its exact composition remains unknown, leading to ongoing research and debate. The presence of dark energy counteracts the expected decrease in energy density as the universe expands. This phenomenon is crucial for understanding the universe's accelerated expansion. Further insights can be explored through resources like the Hubble Space Telescope's findings on dark energy.
GarryS
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What is dark energy? What is it composed of?
 
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Good question. As far as I understand it, they don't know yet.
Dark energy is a word used to explain a cosmological constant in cosmology which means that the energy density of the universe is constant, although all the galaxies are moving apart.
So you would initially think that the energy density should be decreasing, but due to the dark energy it actually stays the same.
 
A good discussion here: http://hubblesite.org/hubble_discoveries/dark_energy/
 

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