• Chris Baker

Great News from Outer Space -The James Webb Telescope

Amazing news as the fine adjustments continue, the optics are proving to be on, or above the specifications set - meaning things are very much going to plan and the potential for discovery is enormous.




While the purpose of this image was to focus on the bright star at the centre for alignment evaluation, Webb's optics and NIRCam are so sensitive that the galaxies and stars seen in the background show up.

At this stage of Webb’s mirror alignment, known as “fine phasing,” each of the primary mirror segments have been adjusted to produce one unified image of the same star using only the NIRCam instrument. This image of the star, which is called 2MASS J17554042+6551277, uses a red filter to optimize visual contrast.


Following the completion of critical mirror alignment steps, NASA’s James Webb Space Telescope team expects that Webb’s optical performance will be able to meet or exceed the science goals the observatory was built to achieve.


On March 11, the Webb team completed the stage of alignment known as “fine phasing.” At this key stage in the commissioning of Webb’s Optical Telescope Element, every optical parameter that has been checked and tested is performing at, or above, expectations. The team also found no critical issues and no measurable contamination or blockages to Webb’s optical path. The observatory is able to successfully gather light from distant objects and deliver it to its instruments without issue.

While the purpose of this image was to focus on the bright star at the centre for alignment evaluation, Webb's optics and NIRCam are so sensitive that the galaxies and stars seen in the background show up. At this stage of Webb’s mirror alignment, known as “fine phasing,” each of the primary mirror segments have been adjusted to produce one unified image of the same star using only the NIRCam instrument. This image of the star, which is called 2MASS J17554042+6551277, uses a red filter to optimize visual contrast. Credits: NASA/STScI

Although there are months to go before Webb ultimately delivers its new view of the cosmos, achieving this milestone means the team is confident that Webb’s first-of-its-kind optical system is working as well as possible.



If you want to follow our favourite space robot then here's the link! Worth Bookmarking too.


Here's the link: https://www.webb.nasa.gov/content/webbLaunch/whereIsWebb.html



Illustration of the James Webb Telescope




Illustration showing the enormous sun-shield.




How did it get there?


An illustration of the deployment to L2






What is it going to do?


The early Universe

The JWST will be able to look back to around 200 million years after the Big Bang, when the first stars in the Universe formed.

The first stars are thought to have been massive giants made of hydrogen and helium, whose short lives ended in the supernovae that created the heavier elements we detect in younger stars today. To see this period in cosmic history, we need sensitive infrared instruments to detect the faint traces of light that have travelled through space and time to reach us.


Ancient galaxies

The JWST will also look back to the very first galaxies in the Universe to learn more about their evolution and why there’s so much variety in them. Nearly all the spiral and elliptical galaxies that we see today have experienced at least one collision or merger with another local galaxy.

Yet older galaxies look entirely different to their modern counterparts – smaller, clumpier, less structured. Examining galaxies can also inform us of the macrostructure of the Universe and how it’s organised on a large scale.

Dark matter

Dark matter is thought to play an important role in the structure of the Universe, accounting for five times the mass of normal matter such as atoms. Considered to be the scaffolding for the Universe, we’re only able to observe dark matter indirectly by measuring how its gravity affects stars and galaxies.

The JWST won’t be able to see dark matter, but it will employ techniques to study the most distant galaxies and look at their rotation for signs that dark matter is at play.

Exoplanet atmospheres

The JWST will help answer the big question of whether life exists beyond Earth by studying a variety of exoplanets – planets outside our Solar System.

Of particular interest is the TRAPPIST-1 system, where three of its seven planets are in the habitable zone and one may harbour liquid water. The JWST will observe the planet as light from its parent star passes through the planet’s atmosphere, revealing its chemical composition and the gases that are present there.

Our ice giants

While the JWST’s primary science aims lie more in cosmology and star formation, it’ll also take a closer look at a couple of familiar objects – our ice giants, Neptune and Uranus.

The JWST will map their atmospheric temperatures and chemical composition to see how different they are – not only to each other, but also their gas giant cousins, Jupiter and Saturn. The ice giants are at least 30 times further from the Sun than Earth and are the least understood planets in our Solar System.


Pluto and the Kuiper Belt Objects

Dwarf planet Pluto and its fellow Kuiper Belt Objects will also be receiving some observation time.

The JWST is powerful enough to study such icy bodies including comets, which are often-pristine leftovers from our Solar System’s days of planet formation and could hold clues to Earth’s origins. There are no planned missions dedicated to the outer Solar System for years, so new observations and data will play a big part in planning for future planetary missions.



Why ‘James Webb’?

James Webb was head of NASA. He oversaw NASA from the beginning of the Kennedy administration through to the end of the Johnson administration, (1961-68) thus overseeing all the critical first manned launches in the Mercury through Gemini programs, until just before the first crewed Apollo flight. He also dealt with the Apollo 1 fire.


https://www.webb.nasa.gov/content/webbLaunch/whereIsWebb.html

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