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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 ...

Galaxies collision vs Black Holes

When Galaxies Collide, Black Holes Don't Always Get the Feast They Were Hoping for

When galaxies collide, it drives enormous amounts of gas and dust into the central region of a galaxy, where there's often a supermassive black hole lurking and waiting for a feast. Astronomers have found surprising evidence that these mergers don't always deliver the meal the black hole was hoping for. They've seen several examples where galaxies merged, and there was no resulting quasar flaring up at the middle.

Read the full story by Evan Gough

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