But Gross wasn’t worried about the expansion itself.
No, Gross was worried about mathematics.
What is it physically made out of?
Reading between the lines of space-time
Every so often,two enormous black holes collide.
Animation of gravitational waves produced by a fast binary orbit.
They’re called the US Laser Interferometer Gravitational-Wave Observatory and the Italian Virgo observatory.
They might shed light on the Hubble constant.
But if you keep watching those ripples extend outward, they get sort of wider and blunter.
“This gives you a measure of the expansion of the universe.”
Is there a catch?
“At that point, it would be an incredibly powerful method to learn about the universe.”
