My Star Talk explainer-12/15/23

Assuming the big bang is correct, space is expanding because it is still in the process of exploding from the big bang....When something explodes, it speeds up, then slows once it finishes exploding and 'falls to earth' or simply settles, which would be to come to a constant speed in a vacuum such as space... The measured expansion of space means it is still in the exploding state and had not yet settled.