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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 ...

Old at heart: Solution to red giants' age paradox

Four years ago, several red giant stars were discovered to pose a paradox: even though they are built from old stellar material, their large masses indicate a younger age. Scientists have now solved the contradiction. Several of the investigated red giants must have merged with others during an advanced stage of stellar evolution, they conclude. In these cases, mass is not a suitable criterion for age determination; the stars are old.

from Space & Time News -- ScienceDaily https://ift.tt/2xiNBhI

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