What about brake fluid which is said to be incompressible. When I push down the brake pedal, the master cylindre pushes the brake liquid inside the hoses which tightens the brakes immediately? So what is the speed of propagation in this scenario if it cannot be faster than c even though brake fluid seems incompressible?
By Siv Schwink
September 3, 2013
Tonight, as the sun sinks below the horizon, the world’s most powerful digital camera will turn its gleaming eye skyward once again in its 5-year mission to map the southern sky in more detail than ever before. On August 31, the Dark Energy Survey (DES), with an international collaboration of more than 200 scientists, officially began the largest galaxy survey ever attempted.
Counting galaxy clusters. While gravity pulls mass together to form galaxies, dark energy pulls it apart. The Dark Energy Camera will see light from 100,000 galaxy clusters billions of light years away. Counting the number of galaxy clusters at different points in time sheds light on this cosmic competition between gravity and dark energy.
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