Recently, Ian has carried out calculations of the speed of light.
This wasn't a particularly difficult task, as long as one had high-quality lenses and a stable mechanical axis, and with Ian's identity, he could easily obtain high-quality measuring tools through any channel.
The results were actually quite fascinating: the speed of light was normal.
Although the calculated speed of light wasn't exactly the same as that of Earth, it was within an acceptable margin of error.
And the gravitational constant test conducted with a Cavendish torsion balance also proved that the gravity of Terra was completely identical to Earth's.
Up to this point, there wasn't much to be surprised about, as so far the Terra Universe seemed to be principally a material world, and almost all phenomena were consistent with the Earth Universe. Even if they are not the same universe, they are at least extremely similar parallel universes.
But the problem was that Terra was very massive.
