The universe's expansion may actually have started to slow rather than accelerating at an ever-increasing rate as previously thought, a new study suggests.
"Remarkab...
The redshift is tied to velocity but distance can be measured with the “standard candle method” where a “standard candle” is a star/body that we know the size and distance of. I don’t remember/understand the specifics of how a standard candle comes be (telescopes I guess?) IIRC they use a bit of trigonometry along with the flicker rate/brightness to find the distance of bodies.
So they have a way to measure the distance completely independently of how they measure velocity (redshift/blueshift). Those values didn’t match up but the distance between bodies was observed to be constantly increasing across the board which is why they came to the expansion conclusion.
The redshift is tied to velocity but distance can be measured with the “standard candle method” where a “standard candle” is a star/body that we know the size and distance of. I don’t remember/understand the specifics of how a standard candle comes be (telescopes I guess?) IIRC they use a bit of trigonometry along with the flicker rate/brightness to find the distance of bodies.
So they have a way to measure the distance completely independently of how they measure velocity (redshift/blueshift). Those values didn’t match up but the distance between bodies was observed to be constantly increasing across the board which is why they came to the expansion conclusion.