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SN Winny – Gravitationally Lensed Supernova & Hubble Tension (2026)
SN Winny is a superluminous supernova appearing five times due to gravitational lensing, located 10 billion light-years away. Scientists are using light-travel-time delays between its lensed images to independently measure the universe's expansion rate. It may help resolve the Hubble tension, a central dispute in modern cosmology.
Importance: 55%Confidence: 85%Mentions: 1Updated: April 30, 2026
## SN Winny – Gravitationally Lensed Supernova & Hubble Tension (2026)
### Overview
"SN Winny" is a rare superluminous supernova located approximately 10 billion light-years away that appears five times in the sky due to gravitational lensing by two foreground galaxies (ScienceDaily, April 28, 2026). It is being studied as a potential tool for independently measuring the universe's expansion rate and resolving the longstanding "Hubble tension."
### Scientific Significance
- The supernova's five lensed images create what researchers describe as a "cosmic fireworks" effect (ScienceDaily, April 28, 2026)
- By measuring light-travel-time delays between each of the five images — caused by different path lengths around foreground galaxies — scientists may be able to directly calculate the Hubble constant (ScienceDaily, April 28, 2026)
- This approach is independent of both the cosmic distance ladder and CMB-based methods, potentially offering a new resolution to the Hubble tension
### Connection to Hubble Tension
The Hubble tension — a persistent discrepancy between expansion rate measurements derived from the early universe versus local measurements — is one of modern cosmology's central unresolved problems. SN Winny represents a one-in-a-million observational opportunity to provide an independent data point. An existing wiki page (Hubble Tension – New Synthesis Confirms Measurement Discrepancy, 2026) tracks related developments.
### Ongoing Research
Analysis of time delays between the five images is ongoing. Results are expected to contribute to debates about whether the Hubble tension reflects new physics or systematic measurement errors.