BERLIN, June 3 — Astronomers have made a groundbreaking discovery, finding an exceptionally rare supernova, nicknamed SN Winny, that appears in the sky five separate times due to gravitational lensing. The supernova lies about 10 billion light-years away, with its light passing near two massive foreground galaxies whose gravity bends spacetime, sending the light toward Earth along several paths of different lengths, resulting in the same explosion reaching us at slightly different times, like five cosmic echoes.
Researchers spent six years searching for such a phenomenon, and the chance of finding a perfectly aligned superluminous supernova is less than one in a million.
The Discovery and Its Implications
By measuring the time delays between the different instances of the supernova, scientists can independently calculate the Hubble constant, which describes how fast the universe is expanding, offering a fresh route into the long-standing Hubble tension, where two established methods give different answers. This breakthrough could have significant implications for our understanding of the universe, as it provides a new way to calculate the Hubble constant, potentially resolving the existing discrepancies between different methods.
Gravitational Lensing and the Supernova
The gravitational lensing effect that allows us to see the supernova five times is a result of the massive foreground galaxies’ gravity bending spacetime, creating multiple paths for the light to reach Earth, each with a slightly different length, resulting in the time delays between the different instances of the supernova. The discovery of SN Winny is a testament to the dedication and perseverance of the researchers from TUM, LMU and the Max Planck Institutes, who spent six years searching for such a rare phenomenon.
Now, scientists will be able to study the supernova in greater detail, analyzing the time delays and the properties of the explosion to gain a deeper understanding of the universe and its expansion.
What’s Next
As researchers continue to study SN Winny and its implications, we can expect new insights into the universe and its expansion, potentially resolving the Hubble tension and providing a more accurate understanding of the cosmos. With this discovery, scientists will be able to refine their calculations and gain a deeper understanding of the universe, and we can look forward to new breakthroughs and discoveries in the field of astronomy.
