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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 ...

The Cygnus Loop

The Cygnus Loop (also known as the Veil Nebula) is a supernova remnant, the detritus of the explosive death of a massive star about ten to twenty thousand years ago. Detailed modeling of its spectacular filamentary shape suggests that the explosion occurred inside an interstellar cavity created by the progenitor star. As is common in astronomy, many of the precise physical properties of the object are rendered uncertain by the uncertainty of its distance. For decades scientists used a value of about 2500 light-years based on analyses of its gas motions by Hubble in 1937 and Minkowski in 1958. Many recent distance estimates have varied over a wide range generally consistent with this one, but the most cited value is a 2005 measurement of between 1500 and 2100 light-years.

from Astronomy News - Space News, Exploration News, Earth Science News, Earth Science https://ift.tt/2RdtjP3

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