How Fast is the Universe Expanding?

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• Dr. Matthew Bothwell, Institute of Astronomy, University of Cambridge
• Tuesday 21 October 2025, 19:00-20:00
• Pfizer Lecture Theatre, Yusuf Hamied Department of Chemistry.

If you have a question about this talk, please contact Yunkai.

Around a century ago, Edwin Hubble made one of the most important discoveries in astronomical history: the Universe is expanding. Ever since Hubble, understanding exactly how fast the Universe is expanding has been one of the most important tasks in cosmology. Today, astronomers are faced with two puzzles: why is the expansion of the Universe speeding up? And why do different experiments disagree about how fast our Universe is expanding?

This talk will discuss the expanding Universe, dark energy, and the ongoing ‘Hubble tension’ (which many people are calling a ‘crisis’ for cosmology!)

This talk is part of the Cambridge University Astronomical Society (CUAS) series.

This talk is included in these lists:

• Cambridge University Astronomical Society (CUAS)
• Pfizer Lecture Theatre, Yusuf Hamied Department of Chemistry

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