BBC Inside Science Is everything we know about the universe wrong?
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Apr 24, 2025 
Catherine Heymans, Scotland's Astronomer Royal and a leading astrophysics professor, discusses groundbreaking revelations about dark energy and its impact on the universe. She explores the recent findings from the Dark Energy Spectroscopic Instrument, challenging long-held assumptions and raising profound questions about existence. The conversation also touches on the intriguing analysis of the Winchcombe meteorite and its significance for understanding water's origins on Earth, blending cosmic mysteries with ancient discoveries.
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Dark Energy May Be Changing
- Dark energy may not be constant; it could be weakening over time, suggesting the universe's current accelerated expansion might slow down.
- This challenges Einstein's cosmological constant and opens possibilities for new theories about the universe's fate.
Caution Needed In Dark Energy Data
- The new dark energy data are promising but require cautious interpretation due to complexities and discrepancies with previous data.
- It's essential to confirm and calibrate results carefully before revising fundamental cosmological models.
Dark Energy and Universe's Fate
- Dark energy determines the fate of the universe; if it weakens or switches off, a universe collapse and rebound could replace the 'big freeze'.
- Such a cyclical universe model offers a different, more dynamic cosmic future than endless expansion.