For several decades, scientists have known that the universe is expanding. The present-day expansion rate of the universe, known as the Hubble constant, has been measured using multiple techniques. These methods, all based on the same physics, have been consistent internally. But now, a team of international physicists, including South African researchers, have developed a new method to measure this expansion rate.
A New Method in the Works
Currently, the most common methods for measuring the Hubble constant include studying the cosmic microwave background radiation or examining the brightness of distant supernovae. These methods, however, rely on a number of assumptions about the universe and its composition.
The new method developed by the international team of physicists reduces the reliance on these assumptions. It uses a technique known as time-delay cosmography, which involves observing the time it takes for light from distant galaxies to reach us. This method also takes into account the gravitational lensing effect, where light is bent by the gravitational field of massive objects.
South Africa’s Role in the Discovery
The South African team of physicists involved in this research contributed significantly to the development of the new method. They were responsible for taking precise measurements of the time delays and analysing the data. Their work was instrumental in verifying and validating the new method.
Their contribution to this international research effort underlines the important role that South African scientists play in pushing the boundaries of our understanding of the universe.
A New Era in Astronomy
The development of this new method to measure the universe’s expansion rate signifies a new era in astronomy. It provides a more accurate and reliable way to measure the Hubble constant and therefore, the expansion rate of the universe.
This new development in the field of astrophysics not only provides a more accurate understanding of the universe but also highlights the significant role that South Africa plays in advancing global scientific research.
It reinforces the importance of international collaboration in scientific research and the significant impact that South African scientists have on the global stage.
The source of this information is Phys.org. To read the original article, visit: https://phys.org/news/2026-02-physicists-method-universe-expansion.html
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