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
Messages
22
Reaction score
0
What is dark energy? What is it composed of?
 
Physics news on Phys.org
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/
 

Thread 'Need help understanding particle physics and quantum physics'

So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
View full post »

Thread 'Raman Spectroscopy help'

I am attempting to use a Raman TruScan with a 785 nm laser to read a material for identification purposes. The material causes too much fluorescence and doesn’t not produce a good signal. However another lab is able to produce a good signal consistently using the same Raman model and sample material. What would be the reason for the different results between instruments?
View full post »

Similar threads

B Is space stretching or is new space being created?
Replies
39
Views
3K
B Can String Theory Be Tested and Solve Cosmic Mysteries?
Replies
7
Views
9K
B Is glow in the dark shirt radioactive?
Replies
6
Views
5K
I Why does the effect linger with Glow in the dark?
Replies
16
Views
5K
B Does energy exist?
Replies
28
Views
3K
I Questions on the consequence of an evolving dark energy parameter
Replies
1
Views
1K
B Dark Energy, Dark Matter and the Speed of Light
Replies
23
Views
3K
I Dark Matter , Dark energy and the Dirac equation
Replies
3
Views
767
I Does dark-energy require a source of energy?
Replies
2
Views
2K
Why two terms "Dark Energy" and "Dark Matter"
Replies
2
Views
1K

Hot Threads

Recent Insights

Back
Top