The “Cosmic Cliffs” build on the legacy of Hubble’s imagery of the Carina Nebula, seen here. Webb’s new view gives us a rare peek into stars in their earliest, rapid stages of formation. For an individual star, this period only lasts about 50,000 to 100,000 years.
Source: @NASAWebb

Two cameras are better than one, as seen in this combined view from Webb’s NIRCam & MIRI! In the near-infrared, we see hundreds of stars and background galaxies. Meanwhile, the mid-infrared shows us dusty planet-forming disks (in red and pink) around young stars.
Source: @NASAWebb

Webb's First Deep Field (NIRISS Emission Spectra)

At far left is a near-infrared image of galaxy cluster SMACS 0723. A group of massive galaxies below and to the right of the bright central star have distorted, magnified, and mirrored many galaxies in this field.

By quickly examining the image at left by eye, it becomes clearer that one arc may be made up of two similar-looking galaxies. Their bright central regions match, despite their stretched appearances. These may be lensed galaxies – one galaxy that is mirrored in a second location. Are they the same? Researchers can’t be sure from the image alone – more data are needed to confirm a match.

Scientists do this by gathering spectra, which spread light out so they can fully examine an object’s makeup. Webb’s Near-Infrared Imager and Slitless Spectrograph (NIRISS), which gathers spectra of every object in any field it observes, was pointed at the galaxy cluster to gather more detail. A segment of the NIRISS grism image (an instrument that has a grating, or stair steps, on a prism), at center, shows how ionized oxygen and atomic hydrogen emission lines are distributed along the arc.

Next, the spectra from each of these two galaxies were plotted as graphs, shown at right, to reveal their compositions. The graphs, known as spectra, match, which indicates that these arcs are mirror images of the same galaxy. Webb’s spectra from NIRISS also quickly proved that light from both galaxies was emitted 9.3 billion years ago, further confirming they are one and the same.

Using Webb’s NIRISS is like opening a treasure chest overflowing with spectra. For example, this instrument can disperse the spectra along the image vertically and horizontally. Researchers can use both modes to untangle which lines match each source.

Every object’s image can be transformed into spectra like the two shown above. So even if researchers aren’t intending to study a particular galaxy in the field, they may make a surprise discovery.

Source
@EverythingScience

As part of Webb’s prep for science, we tested how the telescope tracks solar system objects like Jupiter. Webb worked better than expected, and even caught Jupiter’s moon Europa

These images are designed for engineering purposes, so they aren’t processed in the same way as our first images this week. Like some earlier calibration images, these are processed to emphasize certain features.

https://blogs.nasa.gov/webb/2022/07/14/webb-images-of-jupiter-and-more-now-available-in-commissioning-data
Source: @NASAWebb
@EverythingScience

Where in the night sky exactly are the "cosmic cliffs" from the JWST Carina Nebula images? (4K)

In order to give some context to the amazing images from the James Webb Space Telescope, we wanted to show where exactly the image belongs in the night sky. The scale is truly immense.
Further explanation

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