What's going on with the TOS crew during Discovery? Part.1
To provide some context:
The first episode of discovery takes place in the year 2256
The Enterprise (NCC 1701) launched around 2245. The Enterprise is 11 years old in Discovery and still very much a new starship.
Discovery takes place is three years after the Canon events of the first Original Series pilot and the flashback in the later TOS episode “The Menagerie,” (2253)
During the time of the first Discovery episode Christopher Pike is still in command of the USS Enterprise and is finishing up a 5 year exploratory mission.
Spock is 26 years old and is serving on the USS Enterprise as its science officer.
James T. Kirk is 23 years old and is a Lieutenant aboard the USS Republic. He is finishing his last year in a five year officer training regimen through Starfleet Academy. it will be 9 years till Kirk takes command of the Enterprise.
Nyota Uhura is 17 years old and is more than likely attending classes at Starfleet Academy for advanced phonology and advanced acoustical engineering. She is also a rising star in Starfleet Academy’s Chorale Ensemble. It will be 10 years till she is a Lieutenant assigned aboard the Enterprise.
Montgomery Scott is 34 years old and has been in starfleet for 14 years. it can be assumed that he is serving in an engineering department of a starship or as an engineering advisor for the Deneva colony. it will be 9 years before he is assigned to the Enterprise.
Webb’s giant 6.5-meter diameter primary mirror is part of what gives it superior vision, and it’s coated in gold to optimize it for seeing infrared light.
Why do we want to see infrared light?
Lots of stuff in space emits infrared light, so being able to observe it gives us another tool for understanding the universe. For example, sometimes dust obscures the light from objects we want to study – but if we can see the heat they are emitting, we can still “see” the objects to study them.
It’s like if you were to stick your arm inside a garbage bag. You might not be able to see your arm with your eyes – but if you had an infrared camera, it could see the heat of your arm right through the cooler plastic bag.
We can also see the very first stars and galaxies that formed in the early universe. These objects are so far away that…well, we haven’t actually been able to see them yet. Also, their light has been shifted from visible light to infrared because the universe is expanding, and as the distances between the galaxies stretch, the light from them also stretches towards redder wavelengths.
We call this phenomena “redshift.” This means that for us, these objects can be quite dim at visible wavelengths, but bright at infrared ones. With a powerful enough infrared telescope, we can see these never-before-seen objects.
Because infrared light comes from objects that are warm, in order to detect the super faint heat signals of things that are really, really far away, the telescope itself has to be very cold. How cold does the telescope have to be? Webb’s operating temperature is under 50K (or -370F/-223 C). As a comparison, water freezes at 273K (or 32 F/0 C).
How do we keep the telescope that cold?
Because there is no atmosphere in space, as long as you can keep something out of the Sun, it will get very cold. So Webb, as a whole, doesn’t need freezers or coolers - instead it has a giant sunshield that keeps it in the shade. (We do have one instrument on Webb that does have a cryocooler because it needs to operate at 7K.)
Also, we have to be careful that no nearby bright things can shine into the telescope – Webb is so sensitive to faint infrared light, that bright light could essentially blind it. The sunshield is able to protect the telescope from the light and heat of the Earth and Moon, as well as the Sun.
Out at what we call the Second Lagrange point, where the telescope will orbit the Sun in line with the Earth, the sunshield is able to always block the light from bright objects like the Earth, Sun and Moon.
How do we make sure it all works in space?
By lots of testing on the ground before we launch it. Every piece of the telescope was designed to work at the cold temperatures it will operate at in space and was tested in simulated space conditions. The mirrors were tested at cryogenic temperatures after every phase of their manufacturing process.
It will move to Northrop Grumman where it will be mated to the sunshield, as well as the spacecraft bus, which provides support functions like electrical power, attitude control, thermal control, communications, data handling and propulsion to the spacecraft.