3 ms·
>However, for the past ~6 billion years, distant galaxies have been speeding up in their recession, and the expansion rate, though still dropping, is not headed
by _madmax_ 3y ago
>However, for the past ~6 billion years, distant galaxies have been speeding up in their recession, and the expansion rate, though still dropping, is not headed toward zero.
Am I not getting something here or is this sentence not make sense?
- XzAeRosho 3y agoThe rate of acceleration is slowing down, but still is accelerating.
- bonzini 3y agoSo the first derivative was already understood to remain nonzero forever[1], now we know that the second derivative probably will also remain nonzero, and the third is slowing down but still positive for the moment? [1] IIRC in the 80s the big bang/big crunch model was preferred
- vidarh 3y agoIt makes sense if the expansion rate isn't dropping linearly and the rate of the drop is itself dropping towards zero.
- layer8 3y agoThis article explains it in more detail: https://bigthink.com/starts-with-a-bang/universe-expansion-not-accelerating/ https://bigthink.com/starts-with-a-bang/universe-expansion-n...
- BurningFrog 3y agoThe slowing down is speeding up. What could be simpler?