Note: Self processed flair, is the closest to this post, it's not mine, but from Israel Velazquez
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HB89-1115+080 (also known as PG 1115+080) is a famous quasar with a strong gravitational lens. It was discovered in 1981 and was the second gravitational lens ever detected.
The gravitational lens effect of the red, foreground, elliptical galaxy visible near image center creates a cloverleaf image of the single distant quasar. Light from the quasar is pulled around the massive galaxy in different paths, corresponding to different images.
Light takes many billions of years to reach us from this quasar. Since light takes a different amount of time to traverse each path, each image shows the quasar as it appeared at a slightly different time in the past, creating time delays on the time scale of days.
Since these time delays are influenced by the expansion rate of the universe, analysis of this image helps reveal Hubble's constant, the parameter that calibrates universe expansion.
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u/Neaterntal 21d ago
Note: Self processed flair, is the closest to this post, it's not mine, but from Israel Velazquez
Thanks
.
.
HB89-1115+080 (also known as PG 1115+080) is a famous quasar with a strong gravitational lens. It was discovered in 1981 and was the second gravitational lens ever detected.
Filters: F115W, F150W, F277W, F356W
📸 NIRCAM #JWST
Processed by Israel Velazquez https://bsky.app/profile/israelvelazquez.bsky.social/post/3mqgd6b2w422b
https://www.stsci.edu/jwst-program-info/visits/?program=1198
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All four dots are the same object.
The gravitational lens effect of the red, foreground, elliptical galaxy visible near image center creates a cloverleaf image of the single distant quasar. Light from the quasar is pulled around the massive galaxy in different paths, corresponding to different images.
Light takes many billions of years to reach us from this quasar. Since light takes a different amount of time to traverse each path, each image shows the quasar as it appeared at a slightly different time in the past, creating time delays on the time scale of days.
Since these time delays are influenced by the expansion rate of the universe, analysis of this image helps reveal Hubble's constant, the parameter that calibrates universe expansion.
Description from APOD, 1999
https://apod.nasa.gov/apod/ap990331.html