Ultra-high energy cosmic rays are orders of magnitude more powerful than the sun's energetic particles: They can reach up to 10 20 electron volts, whereas particles from the sun can reach up to 10 ...

New theory proposes a cosmic 'off switch' Scientists claim to find 'first observational evidence supporting string theory,' which could finally reveal the nature of dark energy "Type Ia supernovae ...

Measurements of the faint afterglow of the Big Bang (known as the cosmic microwave background) are also important. They do not directly measure dark energy or how it evolves, but they provide clue ...