Not exact matches
As detailed in this video, Laniakea's discovery emerged from measurements of galactic positions and velocities that reveal how
galaxies are
moving in relation to concentrations of
nearby matter and the universe's overall expansion.
The net velocity of 690 kilometres per second relative to the microwave background was towards the constellation Virgo, 80degree away from the direction in which
nearby galaxies are
moving.
Only when we look at
galaxies billions of light - years away, collecting the light they emitted billions of years ago, can we see that the most distant
galaxies are
moving more slowly than we would expect from observations of
nearby galaxies, an indication that the universe has since sped up.
Unlike most
nearby stars, «Oumuamua
moves very slowly compared to the average motion of the rest of the
galaxy.
Taking into account that the relatively
nearby (in the sky)
galaxy M98 is approaching us at 125 km / sec, and thus
moving at about the same peculiar velocity but, by chance, toward us, one may speculate that these two
galaxies might have been involved in an encounter, but this is currently not much more than wild speculation.
Re 51 Tom P — watched the video; and I agree that the sun does wobble around the center of mass of the solar system; the center of mass itself is not tending to wobble around the sun because conservation of momentum applies to the solar system as a whole (except of course for the forces applied to it by
nearby stars, the rest of the
galaxy, etc, but those are not varying so fast and so the center of mass should generally be
moving along rather smoothly on the same timescale as planetary motions).