Discover and read the best of Twitter Threads about #WebbSeesFarther

Most recents (11)

What you see here is a transmission spectrum made from a single observation using Webb’s NIRISS instrument. Let's take a closer look at it 👇
A transmission spectrum is made by comparing starlight filtered through a planet’s atmosphere as it moves across the star, to the unfiltered starlight detected when the planet is beside the star 👇
🔴 Each of the 141 data points (white circles) on this graph represents the amount of a specific wavelength of light that is blocked by the planet and absorbed by its atmosphere 👇
Read 11 tweets
📢#Webb reveals details of the Southern Ring planetary nebula that were previously hidden, helping us better understand how stars evolve and transform their environments. Read more here: or below 👇#WebbSeesFarther
Some stars save the best for last 💥 Planetary nebulae are the shells of gas and dust ejected from dying stars — making for a spectacular view. Since they exist for tens of thousands of years, observing such a nebula is like watching a movie in exceptionally slow motion 👇
Two stars, which are locked together in a tight orbit, shape the local landscape of this planetary nebula. Webb's infrared images feature new details in this complex system 👇
Read 7 tweets
📢 #Webb reveals steamy atmosphere ♨️ of exoplanet WASP-96 b, capturing the distinct signature of water 💧 along with evidence for clouds & haze — the most detailed measurements of this kind to date. Read more here: or below 👇 #WebbSeesFarther
WASP-96 b is a hot, puffy gas giant planet orbiting a distant Sun-like star. On 21 June, Webb’s #NIRISS measured light from the WASP-96 system for 6.4 hours as the planet moved across the star 👇
The result: a light curve— showing the overall starlight dimming during transit, when the planet blocks some starlight, and a transmission spectrum— made by comparing starlight filtered through a planet’s atmosphere to unfiltered starlight when the planet is beside the star 👇
Read 5 tweets
Encore 2h environ avant de voir les autres photos !
(Pitié ne mettez plus la musique 🤪🙏😅)
Ça se passe ici par ex. :…
Mais il y a plein de chaînes Twitch ou YouTube qui feront des reacts en live aussi, et plein de comptes Twitter comme moi
🤩 Hype #JWST
Pour patienter, quels sont les objets qui vont être révélés ?
Un petit thread en attendant :
1/4: on aura le droit à un bel amas de galaxies en collisions, la Quintette de Stephan que l'on peut voir en lumière visible grâce à Hubble.
James Webb lui nous le montrera en infrarouge.
2/4: une bien jolie nébuleuse planétaire, la Nébuleuse de l'Anneau Austral. Une étoile comme le Soleil qui arrivé en fin de vie a expulsé ses couches externes pour ne laisser que son coeur sous forme d'une naine blanche au centre.
Pareil, là c'est Hubble en visible
Read 7 tweets
1/ 📢 This is an image mosaic of 18 randomly organised dots of starlight, the product of #Webb 's unaligned mirror segments all reflecting light from the same star back at Webb's secondary mirror and into #NIRCam's detectors. Thread 👇 with a surprise at the end!
2/ The mosaic was created by pointing the telescope at a bright, isolated star in the constellation Ursa Major known as HD 84406, chosen specifically because it's easily identifiable and not crowded by other stars of similar brightness, which helps to reduce background confusion
3/ Each dot within the mosaic is labeled by the corresponding primary mirror segment that captured it. These initial results closely match expectations and simulations.
Read 12 tweets
Taking #Webb's temperature 🌡️ 5 new temperature monitoring points have been added to the NASA website to track cooling and status of the instruments during the post L2 arrival commissioning process. Let's have a look at them 👇
1/ Temperature control is a vital aspect of #Webb 's design, engineering and operations. On the page you can see 2 "hot side" and 2 "cold side" temperatures and a set of bellweather instrument temperatures
2/ The instruments are located within the Integrated Science Instrument Module and the Fine Steering Mirror is located within the protrusion in the center of the primary mirror
Read 7 tweets
Some of you asked recently why are #Webb's mirrors hexagonal? Thread 👇
📷 NASA/Chris Gunn
1/ The hexagonal shape enables a roughly circular, segmented mirror with "high filling factor and six-fold symmetry." High filling factor just means the segments fit together without gaps, which would not be the case if the segments were circular
2/ Symmetry is good because only 3 different optical prescriptions (A, B and C) are needed for 18 segments, 6 of each as seen below 📷 NASA
Read 4 tweets
As #Webb is going through the focusing of its mirrors, let's look into what this process entails. #WebbSeesFarther 👇
1/ #Webb's 18 hexagonal mirrors have already been unfolded a while back, but now it's time for a more precise alignment so they point in exactly the same direction 🎯 and deliver sharp images.
📷 NASA/Chris Gunn Image
2/ These corrections are made through a process called 〰️ wavefront sensing and control, which senses and corrects any errors in the telescope's optics, aligning the mirrors to within tens of nanometres
Read 8 tweets
1/ The Mid-InfraRed Instrument #MIRI is one of 4 instruments on the James #Webb Space Telescope. The only mid-infrared instrument in its instrument suite. #WebbSeesFarther
📷 NASA/ Chris Gunn
2/ Thanks to state-of-the-art instrument design and components, it will deliver mid-infrared images and spectra with an unprecedented combination of sharpness and sensitivity. #WebbSeesFarther
3/ #MIRI will be capable of penetrating thick layers of dust obscuring regions of intense star birth. It will see the first generations of galaxies to form after the #BigBang, and it will study sites of new planet formation and the composition of the interstellar medium.
Read 4 tweets
OK, Internet. Are you ready for our gallery "The Beauty of the @NASAWebb @ESA_Webb MIRI Instrument Filter wheel"? Because it *is* beautiful, and @mpi_astro is quite proud of contributing to that amazing space telescope! Let's start with the classic face-on look. 1/ MIRI Filter Wheel from the side
Also available in the Roy Lichtenstein (?) version. (OK, this is actually the 3D design by @mpi_astro and @ZEISS_Group, taken from this 2005 press release. We've been working for a long time on this!) Design of the MIRI filter wheel.
With that amount of elegance and beauty, you won't be surprised to learn that the MIRI filter wheel has been doing some modelling gigs. Here it is as one of the faces of the IAU's strategic plan 2020-2030. 3/
Read 53 tweets
1/ While everyone's eyes were on the shield tensioning, the Mid-Infrared Instrument (MIRI) provided by @esa for #Webb also had an important milestone: unlocking the Contamination Control Cover, which had to be locked for launch.
🎥 ESA/ATG medialab
@esa 2/ After successfully completing the tests and unlocking the cover, the instrument control electronics were then powered off before the next steps on the sunshield tensioning activities.
@esa 3/ This key step for MIRI was monitored remotely by team members in Europe, ready to provide assistance if it were needed.
Read 5 tweets

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