Quasars as the new cosmic standard candles

[notFritzArgelander]

https://phys.org/news/2021-09-quasars-c ... ndles.html

[SparWeb]

How does any publisher reach the point that they "know" they can publish the new edition of their astronomy textbook?

When the next day there could be....

Something like a new std. candle could force so many things to change.

[helicon]

This is new to me:

The most distant known quasars have been spotted from an era only about seven hundred million years after the big bang, dramatically extending the range of standard candle redshifts. Another advantage of quasars is that hundreds of thousands of them have been discovered in the past few years.

I had no idea that many quasars have been discovered!

[GCoyote]

This is new to me:

The most distant known quasars have been spotted from an era only about seven hundred million years after the big bang, dramatically extending the range of standard candle redshifts. Another advantage of quasars is that hundreds of thousands of them have been discovered in the past few years.

I had no idea that many quasars have been discovered!

Same here. Probably a side effect of my first reading about them in `70s when count was much lower.

[notFritzArgelander]

How does any publisher reach the point that they "know" they can publish the new edition of their astronomy textbook?

When the next day there could be....

Something like a new std. candle could force so many things to change.

It’s a risk. Folks who need absolute certainty never accomplish anything.