Why NASA doesn't give the conversions in parentheses is beyond me. Surely they know that people around the world use another system, and that even in the USA, many people consulting the website have an interest in science and therefore know about the SI system.
(Or am I wrong on the latter ... are degF, inches, pounds, etc used in science teaching in the USA?)
For a general consumption science article targeting an American audience it makes sense that Fahrenheit is used, because American's are used to it and its convenient for human temperatures. (More precision per degree, 0-100 is a common temperature range, mostly human comfortable).
Of course clearly including Celcius alongside Fahrenheit would make a lot of sense, I agree its strange that both were not included.
It's all about what you're used to, really.
It indeed is just about getting used to it. Precision of Farenheit actually gets in the way, usually we don't really care if it is 41F or 42F. It's the same. Wear a jacket.
I still can't get used to cm for measurement of everyday objects. Inches are just so easy for me.
In terms of weight/volume, I use ml/liters for fluids and g/kg for weight everywhere I can.
What led you to believe this was targeting an American audience? Do you think kids in other countries don’t know about space, or aren’t interested?