Sagittarius A-Star's latest activity
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Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.It makes no difference if we take the old or new definition of "1 meter". Both definitions lead to ##c\approx 3\cdot 10^8\frac{m}{s}##. -
Sagittarius A-Star replied to the thread Space Stuff and Launch Info.There are currently 37 active Russian Rassvet satellites in orbit. https://satellitemap.space/en/constellation/rassvet Future Rassvet...
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Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.A re-definition of "1 meter" (by assigning a different numerical value for ##c## in the SI-definition) would not change physics. But it...
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Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.This would be the measurement of a distance.
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Sagittarius A-Star reacted to GRQFT's post in the thread High School What Medium Does Light Travel Through in Space? with
Like.
Okay, I think this is a good point for me to stop and say thank you to all who have contributed to this discussion. Cheers... -
Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.For example a twin-paradox experiment (Bailey et al. 1977)...
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Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.Transformartion equation (27) in the article can be derived without the 2nd postulate. K<0 : can be excluded (causality would be not...
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Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.No, ##c## is defined by the SI unit system. No measurements are needed. No. If the square-root in posting #30 becomes zero, the energy...
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Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.In spacetime geometry, the following interval is invariant: ##\Delta s^2 = -(c\Delta t)^2 + \Delta x^2 + \Delta y^2 + \Delta z^2## This...
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Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.In SR the invariant speed is finite. The value of ##c## is defined by the SI definition of "1 meter"...
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Sagittarius A-Star replied to the thread High School What Medium Does Light Travel Through in Space?.The vacuum permittivity is a measurable quantity, which depends on the fine structure constant ##\alpha##: ##\varepsilon _{0}={\frac...
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Sagittarius A-Star replied to the thread Undergrad Comparing the time of two moving clocks.That's not correct. Each rocket sees the relativistic Doppler effect. The formula for it can be written as a product of the...
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Sagittarius A-Star reacted to robphy's post in the thread Undergrad How does reciprocal time dilation work? with Like.
Just a postscript... (thanks to a mentor for re-opening this to allow me to make this hopefully-helpful comment) Since the OP recently...
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Sagittarius A-Star replied to the thread LaTeX does not work in my Direct Messages.Now it works. Thank you!
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Sagittarius A-Star replied to the thread LaTeX does not work in my Direct Messages.The problem is still there.