The Universe is increasing, and particular person, certain buildings are all receding away from each other. How, then, are galaxies nonetheless colliding?
Right here in our Universe, an astrophysical phenomenon continues to happen that appears paradoxical. The Universe is increasing, and the enlargement itself is accelerating on account of darkish vitality, inflicting distant objects to recede from each other at ever-increasing charges. After we have a look at galaxies, we see this instantly: the farther away they’re from us, the sooner they recede from our perspective. Furthermore, due to darkish vitality, if we watch any particular person galaxy recede from us over time, we’ll discover that it hastens in its recession: precisely what we imply after we say that the Universe’s enlargement is accelerating.
And but, all throughout the Universe, each close by and much away, galaxies — the very objects that ought to all be receding mutually away from each other — are seen interacting: merging, colliding, and cannibalizing each other. How are these two seemingly contradictory issues each constantly true? How can the Universe be increasing, with galaxies receding away from each other, whereas galaxies are additionally discovering one another, colliding and merging, concurrently? That’s what Tom Peacock…
