The Hubble Controversy


The Hubble Constant Controversy: Status, Implications and Solutions

10 Nov, 08:30 AM to 10:00 PM _ Public | English
Auditorium Friedrichstraße, Friedrichstraße 180, 10117 Berlin

The Hubble law discovered in 1929, i.e. the linear relation between the recession velocity of galaxies and their distance, is the cornerstone of modern cosmology and of the Big Bang model. In this model, the proportionality constant H0 in this relation, the so-called Hubble constant, is also the ratio of the expansion rate and size scale of the cosmos, the inverse ratio thus directly giving the age (and characteristic length) scale of the cosmos. To accurately determine H0 has thus been a major focus in observational cosmology and astrophysics over the past 90 years. However, the history of determining H0 has been full of systematic problems, inconsistencies and controversies from its very beginnings. The next few years are likely to be particularly interesting for further study of the discrepancy.

NASA’s Hubble Space Telescope. Credits: NASA

It is thus the perfect time now to bring together the experts in the various field of astronomy and astrophysics that are concerned with the determination of H0 and the implications of these results, and to discuss the most recent results, prospects, and possible implications, and provide them to a broader audience.

Do we have a Hubble constant crisis? Experts are discussing an old question full of current relevance for the understanding of our universe.

This NASA/ESA Hubble Space Telescope image shows a massive galaxy cluster glowing brightly in the darkness. Despite its beauty, this cluster bears the distinctly unpoetic name of PLCK_G308.3-20.2. Galaxy clusters can contain thousands of galaxies all held together by the glue of gravity. At one point in time they were believed to be the largest structures in the Universe — until they were usurped in the 1980s by the discovery of superclusters, which typically contain dozens of galaxy clusters and groups and span hundreds of millions of light-years. However, clusters do have one thing to cling on to; superclusters are not held together by gravity, so galaxy clusters still retain the title of the biggest structures in the Universe bound by gravity.


The Hubble Space Telescope is a joint ESA/NASA project and was launched in 1990 by the Space Shuttle mission STS-31 into a low-Earth orbit 600 km above the ground. During its lifetime Hubble has become one of the most important science projects ever. credits ESA

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