> energy equals mass
That doesn’t mean energy has a weight.
It means it is physically possible to transition energy to mass and vice versa. Sunlight hitting the earth does not add any weight.
Edit: turns out that part was wrong
Also, earth radiates heat out to space. At a rate of (aaaaaaaaalmost, because of the greenhouse effect) 100% of the energy we get from the sun. If it didn’t, earth would be a few million degrees hot by now…
There is a famous experiment , where a person gets 100$, and have to offer an arbitrary percentage of that to a stranger. If the stranger declines, both get nothing.
From the strangers perspective, getting offered even 1$ is a win, but the vast majority rejected anything below 30%