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Mars and Earth - Small difference & big consequences

Einstein's theory of relativity suggests that time is not a constant and can vary based on gravitational fields and speed. In a strong gravitational field, time moves slower compared to a weaker one. Since Mars has a weaker gravitational field than Earth, time actually flows slightly faster there.  This concept has implications for future space missions, as the timing of communication and operation of spacecraft will need to account for this difference in how time elapses on Mars compared to Earth. Missions may need to adjust their schedules, operations, and technology to ensure accuracy and synchronization with Earth. Basically, the moment you bring gravity and velocity into the picture, time stops behaving like the simple, universal tick‑tock we experience in everyday life. And you’re absolutely right: Mars’ weaker gravity means clocks there run a little faster than clocks on Earth. What’s fascinating is how small the difference is—and how big the consequences become ...

Not so fast, supernova: Highest-energy cosmic rays detected in star clusters

The highest-energy cosmic rays come from subatomic interactions within star clusters, not supernovae, say physicists. For decades, researchers assumed cosmic rays are flung into space from supernova. But new research suggests even supernovae are not strong enough to push particles to petaelectronvolts (PeVs). Instead, the researchers posit that star clusters like the Cygnus Cocoon serve as PeVatrons capable of moving particles at such high energy rates.

from Space & Time News -- ScienceDaily https://ift.tt/3l5C39P

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