What are past values of the Hubble constant and is there an archive for them?

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Discussion Overview

The discussion revolves around the historical values of the Hubble constant and the possibility of finding an archive for these values. Participants explore the implications of these values for understanding the expansion of the universe, as well as the reliability of the underlying assumptions.

Discussion Character

  • Exploratory, Debate/contested

Main Points Raised

  • One participant inquires about the existence of an archive for past Hubble constant values and whether these can be linked to specific historical periods.
  • Another participant suggests that while knowing past Hubble constant values is useful, the scale factor may provide a clearer representation of the universe's size at different times.
  • Some participants express that the expansion history of the universe is based on uncertain assumptions, indicating a level of controversy and debate within the scientific community regarding its reliability.
  • There is a claim that current measurements of the expansion history are not very precise, and one participant argues that referring to it as an "unknown" may underestimate the current understanding of the expansion rate.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the reliability of the expansion history or the Hubble constant values, with multiple competing views expressed regarding their significance and the assumptions involved.

Contextual Notes

Limitations include the uncertainty surrounding the assumptions made in measuring the expansion history and the precision of current measurements of the Hubble constant.

nick1o2
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Hello, I've been looking round trying to find a history of records, showing the speed of which the universe is expanding? Would this just be the hubbles constant? If so I'm looking for past Hubble constant values. Is there an archive for this? or is there a way to work past Hubble constant's to an exacte year (not right on the dot, but some where near that specific time area)?
 
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We have a calculator that can do this.
Knowing past Hubble constant values is sufficient, right, but I think the scale factor is a better value (it directly shows how large the universe was compared to today).
 
The expansion history of the universe is an unknown asserted on not altogether reliable assumptions. It remains a controversial issue in science, IMO. We do, however, have some good guesses as noted by mfb.
 
Last edited:
Chronos said:
The expansion history of the universe is an unknown asserted on not altogether reliable assumptions. It remains a controversial issue in science, IMO. We do, however, have some good guesses as noted by mfb.
The expansion history of the universe is measured. Those measurements aren't all that precise as of now, but I think calling it an "unknown" is significantly understating our understanding of the expansion rate.
 

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