The iconic honeycomb-shaped mirror is likely the first thing you’ll notice when you see the James Webb Space Telescope.
NASA, ESA, and G. Bacon (STScI)
Once the honeycomb mirror captures light from the universe, it reflects that light onto the instruments in the ISIM via secondary mirrors.
Over the past few months, the ISIM’s four instruments have been tested, aligned, and cooled to prepare for their much-anticipated survey of the cosmos.
Once they’re in full swing (very soon!) the instruments will capture never-before-seen views of the universe at wavelengths invisible to the human eye.
Here’s an inside look at JWST’s 4 science instruments:
Containing both a camera and a spectrograph, MIRI can detect infrared light emitted by objects at frequencies far too low for our eyes to see.
But to do this, MIRI has to be extremely cold.
NASA/Goddard Space Flight Center/Chris Gunn
Earlier this month, the instrument reached 7 degrees Kelvin (negative 447 degrees Fahrenheit), and is the coldest instrument onboard the JWST.
NIRCam is the JWST’s primary imaging system. It will detect near-infrared wavelengths, which are at higher frequencies than the ones MIRI will see, but still invisible to the human eye.
It has the ability to block out light from target stars, which will give us crisper, clearer views of planetary systems that would be otherwise obscured.
NIRSpec will also detect light on the near-infrared spectrum, but will decode different information from objects than the cameras on board.
As a spectrograph, NIRSpec will use incoming light to parse out the physical properties of distant objects such as their mass, chemical composition, and temperature.
It also has a tool called a microshutter array that will allow the instrument to survey several objects in the sky at once.
A long name for a complicated instrument!
The purpose of the FGS/NIRISS is twofold: to point the telescope precisely, and to investigate objects at near-infrared wavelengths.
The FGS does the guiding, while the NIRISS will detect the movements of exoplanets and try to find some of the oldest objects in the universe.