The Changing Hubble Constant
Your Hubble plot was made from observations of a small sample of nearby galaxies. Rubin Observatory will detect millions of supernovae in host galaxies that are much farther away and dimmer than the galaxies you have investigated so far. This plot shows the galaxies you plotted (as colored points), and data for over a thousand supernovae and galaxies (as grey points) detected by Rubin Observatory.
Notice not all the data points fit onto the trendline.
Observations of distant galaxies are leading to new insights about the Universe: The expansion rate of the Universe has changed over time. Many cosmologists attribute this change to the role of dark energy. Astronomers are actively engaged in new research to better understand the nature of dark energy. There are still many more secrets of the Universe to discover.
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