# New JWST Data Investigates 'Hubble Constant' Discrepancy in Universe's Expansion! 🔭

**URL:** <https://onehack.st/t/new-jwst-data-investigates-hubble-constant-discrepancy-in-universes-expansion/292991>\
**Category:** News & Articles\
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**Created:** [October 7, 2024, 3:42pm UTC](https://onehack.st/t/new-jwst-data-investigates-hubble-constant-discrepancy-in-universes-expansion/292991 "2024-10-07T15:42:16Z")\
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**Author:** ![TheJoker](https://onehack.st/user_avatar/onehack.st/thejoker/32/22660_2.png) [@TheJoker](https://onehack.st/u/TheJoker)\
**Post date:** [October 7, 2024, 3:42pm UTC](https://onehack.st/t/new-jwst-data-investigates-hubble-constant-discrepancy-in-universes-expansion/292991/1 "2024-10-07T15:42:16Z")

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**Summary:**

1. **Expansion Rate Controversy**  
There is ongoing debate among scientists regarding the **Hubble constant** , the value that dictates the universe’s expansion rate, with measurements from different methods yielding conflicting results.

2. **Role of JWST**  
The **James Webb Space Telescope (JWST)** is observing gravitationally lensed supernovas in the early universe, potentially offering a new method to measure the expansion rate and help resolve this “Hubble trouble.”

3. **Supernova Hope**  
A recently discovered supernova, dubbed **“supernova Hope,”** may provide insights into the universe’s changing expansion rate, as noted by Brenda Frye, a researcher at the University of Arizona.

4. **Discovery Process**  
The investigation began when Frye and her team noticed three points of light in a JWST image of the **PLCK G165.7+67.0** galaxy cluster that were absent in a previous Hubble image from **2015**.

5. **Characteristics of the Supernova**  
Initial analyses revealed that the points corresponded to a **Type Ia supernova** , which is a known standard candle, and that it was gravitationally lensed by a cluster of galaxies, allowing for multiple images.

6. **Measurement Insights**  
By analyzing the time delays and properties of the gravitational lensing, the team calculated the **Hubble constant** as **75.4 kilometers per second per megaparsec** , which aligns with local measurements but contrasts with values from the universe’s early state.

7. **Significance of the Findings**  
This measurement represents only the second instance of the Hubble constant being calculated through this method, marking a significant advancement in understanding the universe’s expansion dynamics.

**Read more at:** [Space.com](https://www.space.com/james-webb-space-telescope-hubble-tension-supernova-hope) | [NASA Blog](https://blogs.nasa.gov/webb/2024/10/01/webb-researchers-discover-lensed-supernova-confirm-hubble-tension/)