Image 1 Caption: A cartoon illustrating the nested hierarchy of (astrophysical) center-of-mass (CM) inertial frames (called center-of-mass free-fall inertial frames in the cartoon) in the observable universe and an astrophysical rotating frame (attached to, e.g., a moon, planet or star). In our discussion below, we do NOT consider rotating frames. For those, see the Mechanics files: frame_rotating.html and frame_inertial_free_fall.html.
In this figure, we explicate (astrophysical) CM inertial frames and their largest special case comoving frames which are NOT illustrated in the cartoon in Image 1, but of which there is an example in Image 2 below.
Features:
Note, CM inertial frame is often used as a natural synonym for the system of astro-bodies it is used to analyze.
The Laniakea Supercluster
is marked in yellow in
Image 2.
Our peculiar velocities:
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