5 ms·

James Webb Space Telescope (JWST) first full-color image

36 points by kklisura 4y ago

kklisura 4y ago
The URL points to thumbnail version of the image (985x1005). It seems that full image is available here: https://www.nasa.gov/sites/default/files/thumbnails/image/main_image_deep_field_smacs0723-5mb.jpg https://www.nasa.gov/sites/default/files/thumbnails/image/ma... (2799x2856). I can't edit the link, so maybe some of the admins can do that. Update: Hi resolution image also available here https://esawebb.org/media/archives/images/original/webb-first-deep-field.tif https://esawebb.org/media/archives/images/original/webb-firs... (4537x4630, ~39MB)
knolan 4y ago
We’ve come a long way since Einstein ́s Eclipse in 1919 when it comes to observing gravitational lensing. https://www.discovermagazine.com/the-sciences/how-the-1919-solar-eclipse-made-einstein-the-worlds-most-famous-scientist?ref=hvper.com https://www.discovermagazine.com/the-sciences/how-the-1919-s...
leto_ii 4y ago
Since I'm a complete noob at astronomy, I wanted to ask a couple of basic questions about the image: 1. What causes the bright flares/flashes around some bright starts/galaxies? 2. What are the elongated traces that look as if the telescope moved/rotated while capturing the image? 3. Why do some of the smaller flares seem to be doubled (e.g. 3 stars in the top-right corner of the image)? Thanks in advance to anybody patient enough to explain.
- kryptiskt 4y ago
  1. Those are diffraction spikes that reflects the structure of the mirror, which is composed of hexagonal elements. 2. That is background galaxies that are distorted and heavily magnified due to gravitational lensing, gravity from a foreground galaxy can bend the light just like a lens (the sun bending the light from stars during an eclipse was an early test of general relativity just after WWI)
  - 8note 4y ago
    Duplication can also come from gravitation lensing, as the light from the bright thing bends around either side of the heavy thing
  - tkinom 4y ago
    There should be some post post-processing algorithms that can remove/clean hex elements, right?
  - peppertree 4y ago
    I can see lots of galaxies that are rather dim. Are the stars with diffraction spikes really close or just extra bright?
- deleted 4y ago
  [deleted]
mgomez 4y ago
For comparison, here's a view of SMACS 0723 from Hubble: https://bigthink.com/wp-content/uploads/2022/07/smacs0723-73.jpg https://bigthink.com/wp-content/uploads/2022/07/smacs0723-73... > This image of galaxy cluster SMACS 0723 has been constructed from blue, green, and red filters aboard Hubble, along with four infrared filter views of the cluster’s central regions. Hubble viewed this object to wavelengths of ~1600 nanometers; [1] [1] https://bigthink.com/starts-with-a-bang/universe-before-jwst/ https://bigthink.com/starts-with-a-bang/universe-before-jwst...

36 points by kklisura 4y ago

The URL points to thumbnail version of the image (985x1005). It seems that full image is available here: https://www.nasa.gov/sites/default/files/thumbnails/image/main_image_deep_field_smacs0723-5mb.jpg https://www.nasa.gov/sites/default/files/thumbnails/image/ma... (2799x2856). I can't edit the link, so maybe some of the admins can do that. Update: Hi resolution image also available here https://esawebb.org/media/archives/images/original/webb-first-deep-field.tif https://esawebb.org/media/archives/images/original/webb-firs... (4537x4630, ~39MB)

knolan 4y ago

We’ve come a long way since Einstein ́s Eclipse in 1919 when it comes to observing gravitational lensing. https://www.discovermagazine.com/the-sciences/how-the-1919-solar-eclipse-made-einstein-the-worlds-most-famous-scientist?ref=hvper.com https://www.discovermagazine.com/the-sciences/how-the-1919-s...

leto_ii 4y ago

Since I'm a complete noob at astronomy, I wanted to ask a couple of basic questions about the image: 1. What causes the bright flares/flashes around some bright starts/galaxies? 2. What are the elongated traces that look as if the telescope moved/rotated while capturing the image? 3. Why do some of the smaller flares seem to be doubled (e.g. 3 stars in the top-right corner of the image)? Thanks in advance to anybody patient enough to explain.

kryptiskt 4y ago
1. Those are diffraction spikes that reflects the structure of the mirror, which is composed of hexagonal elements. 2. That is background galaxies that are distorted and heavily magnified due to gravitational lensing, gravity from a foreground galaxy can bend the light just like a lens (the sun bending the light from stars during an eclipse was an early test of general relativity just after WWI)
- 8note 4y ago
  Duplication can also come from gravitation lensing, as the light from the bright thing bends around either side of the heavy thing
- tkinom 4y ago
  There should be some post post-processing algorithms that can remove/clean hex elements, right?
- peppertree 4y ago
  I can see lots of galaxies that are rather dim. Are the stars with diffraction spikes really close or just extra bright?
deleted 4y ago
[deleted]

mgomez 4y ago

For comparison, here's a view of SMACS 0723 from Hubble: https://bigthink.com/wp-content/uploads/2022/07/smacs0723-73.jpg https://bigthink.com/wp-content/uploads/2022/07/smacs0723-73... > This image of galaxy cluster SMACS 0723 has been constructed from blue, green, and red filters aboard Hubble, along with four infrared filter views of the cluster’s central regions. Hubble viewed this object to wavelengths of ~1600 nanometers; [1] [1] https://bigthink.com/starts-with-a-bang/universe-before-jwst/ https://bigthink.com/starts-with-a-bang/universe-before-jwst...