James Webb Telescope Spotted Supernova Athena
The observatory used a gravitational lens to identify the distant explosion in 2025.
Updated on Sept. 30, 2026 in Space
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The James Webb Space Telescope (JWST) observed Supernova Athena in 2025, using the galaxy cluster MACS J0417 as a natural magnifying glass. Astronomers are now monitoring the region for a second, delayed image of the event.
Why it matters
By observing these multiple, time-delayed images, researchers aim to accurately constrain the mass of the galaxy cluster MACS J0417. These measurements also provide critical data to help scientists resolve the Hubble Tension regarding the expansion rate of the universe.
The detection relied on the gravitational lensing effect of galaxy cluster MACS J0417, which magnifies and distorts light from a galaxy existing when the universe was half its current age. Astronomers project a delayed appearance window between September 2026 and March 2027.
The players
James Webb Space Telescope
This infrared space observatory is designed to conduct a broad range of investigations across the fields of astronomy and cosmology.
Hubble Space Telescope
This long-running space telescope provides essential monitoring services for deep space events in coordination with newer observatories.
MACS J0417
This massive galaxy cluster acts as a gravitational lens that bends light from background objects.
The details
Gravitational lensing creates multiple paths for light to travel around a massive object, resulting in the same event appearing to observers at different times. Hubble is currently monitoring the location of MACS J0417 to capture these subsequent images.
Timeline
The JWST identified Supernova Athena during 2025.
A second image of Athena is expected between September 2026 and March 2027.
Supernova Ares is anticipated to reappear in 2086.
The Big Picture
This observation extends existing research into the Hubble Tension by utilizing lensed supernovae to derive precise cosmological measurements. It confirms the utility of gravitational lensing as a laboratory for testing fundamental theories about the expansion rate of the universe.
These observations refine our understanding of the universe's expansion and the distribution of matter within galaxy clusters. Improved models derived from this data eventually help scientists sharpen the precision of global cosmological simulations.
The takeaway
Gravitational lensing serves as a powerful cosmic telescope that allows scientists to see the same event twice across vast distances. This unique phenomenon provides a rare opportunity to calibrate measurements of the universe's history and its accelerating expansion.
What happens next
Astronomers will monitor the region around MACS J0417 from September 2026 through March 2027 to capture the predicted reappearance of the supernova image.
Further reading
Learn more about the latest discoveries from deep space in our Space section.
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Should the government prioritize funding for deep space research projects like those using gravitational lensing?
