Hi Freddo
Thanks for reply and welcome.

I was so eager for a response that I forgot courtesy and even misspelled acceleration. Opps.

But your response leads me to astronomers mistake #2 which is about the "acceleration" of space.

Mistake #2

The expansion of space is accelerating. False

If I walk into a room at 3 miles an hour, and slow to 1 mile an hour I would describe myself as decelerating.

If you observed me walk into the room, you also would describe my motion as decelerating.

Conclusion, An object that moves faster in the past than the present is decelerating.


The further away a galaxy, the faster it is moving away, due to the expansion of space.

The further away the galaxy, the more in the past it is being observed.

A galaxy observed in the past is moving faster than a galaxy observed closer to the present.

An object that is moving faster in the past than the present is decelerating.

Conclusion, The expansion of space is decelerating


Note that distant galaxies observing our galaxies “motion” would also find that we are “moving” faster in the past than the present in that the further away the observer galaxy the “faster” we would appear to be moving. We are decelerating, not accelerating.

snowflake