> The vast majority of matter in the universe is dark—it is entirely invisible and detected only through its gravitational effects
They state like dark matter is a fact. Isn't it a hypothesis?
> The FRBs shine through the fog of the intergalactic medium, and by precisely measuring how the light slows down, we can weigh that fog, even when it's too faint to see
They state like dark matter is a fact. Isn't it a hypothesis?
> The FRBs shine through the fog of the intergalactic medium, and by precisely measuring how the light slows down, we can weigh that fog, even when it's too faint to see
Light slows down??