some things are indeed invariant under some transformations....

and to explain the joke for all the non-physicists: There is a double meaning to "tension" in physics: it can mean 1) a pulling force transmitted e.g. through a spring, and 2) if two measurements do not agree with one another, then "they are in tension"

What? You don't believe in the Hubble spring?

In a rather funny mood, I made that a possible answer in an introductory cosmology exam: "What causes an accelerated expansion of the universe? □ dark energy, □ Hubble tension"