David M. Kelly6d ago
Cosmic voids may be driving the universe's expansion through dark energy. Even emptiness has power. Funny, I've been thinking about voids a lot recently. My novel "A Crimson Void" is out this spring. #science #space #scifi #writing #cosmology ziply.pk/cosmicvoids
Show thread2rad0

@David_Kelly_SF

I've recently been wondering about the lack of mass in these voids, and how gravity is proven to affect the flow of time. If there is less gravitational influence on time would an object travelling at 100,000km/sec near a galaxy end up moving at the same speed in one of these voids if "a second" is flowing at twice the rate as where It started?

Mar 16 at 8:19pmWeb
Show threadDavid M. Kelly5d ago
@2rad0 Gravitational time dilation is real but mass needs to be highly concentrated to have dramatic effects - black holes, neutron stars. The difference between a galaxy cluster and a void is relatively subtle. The object would experience its own spacetime consistently regardless - velocity is always local. Though the philosophical question of what an outside observer would measure is genuinely interesting.