Sagittarius A-Star's latest activity

Acceleration and velocity are not the same thing. An object moving in a circle at constant speed has constant centripetal acceleration...

That's because the related coordinate-acceleration of the ground is relative to a local free falling coordinate-system. Such an inertial...

Source: https://science.nasa.gov/blogs/roman/2026/09/15/nasa-activates-romans-primary-instrument-checks-out-coronagraph/

Both "scenarios" describe the same events: Meeting ##(C=0, A=0)## Meeting ##(C=2, B=3)##

You may have a look at the images in the German Wikipedia that precisely describe, and solve, your scenarios: In scenario 1 (rest frame...

Source: https://militarnyi.com/en/news/russia-soyuz-2-1b-rocket-rassvet-satellites/

Correct. But he thinks the Earth clocks were not properly synchronized, so why would he use them to judge the passage of time on Earth...

Yes. But in the scenario is an asymmetry: 1 clock of observer B is compared to 2 clocks of observer A.

The explanation is:

Yes, but then it would not be an acceleratometer. You can also construct an accelerometer with a lamp and a light sensor, mounted at...

In Einsteins lectures about relativity in 1921 at Princeton University, he took over in SR the ##ict## from Minkowski. See for example...

The mass of a moving rock is ##{E \over c^2}\sqrt{1-v^2/c^2}=m##. The photon is massless because it is moving with ##c##: ##{E \over...

Alternative to @Sagittarius A-Star's rapidity method, you can use ##v/c=\frac{at/c}{\sqrt{1+a^2t^2/c^2}}##. Using years and light years...

I assume you mean the scenario, which you described in the OP. The peak speed is reached in the middle between Earth and Alpha...

It's not so clear if that is actually a failure or just part of the deployment plan. Early Starlink satellites sometimes needed three...