Yet the rare ones known as “ultrahigh-energy” cosmic rays have as much energy as professionally served tennis balls. They’re millions of times more energetic than the protons that hurtle ...

Cosmic rays' power source has long remained a mystery, yet new research may finally provide the answer to where particle ...

Curiously, "cosmic rays" are not actually rays ... contains about as much energy as a tennis ball when Serena Williams serves it at 200 kilometers per hour," said Oikonomou.

However, after reaching an altitude of 5,300 meters, Hess unveiled a natural source of high-energy particles from space. Today, we call those particles cosmic rays. Detecting these high energy ...

Cosmic rays are high-energy particles from outer space that strike Earth's atmosphere, generating showers of secondary particles, such as muons, that can reach the planet's surface. In recent ...

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 ...