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Ask HN: What was the name of this Sci-Fi book?

In a discussion around 2 months ago in HN, related to alien life, there was a reference to a book. The book was about humans visiting an alien world, but humans and aliens moved at different speeds so they had challenges communicating. Sadly it is all I remember, but sounded like an interesting concept. Any idea which book this might have been?
( 3 comments | 4 points | on HN )
Re:Ask HN: What was the name of this Sci-Fi book? by HarryHirsch on Friday July 20, 2018 @10:01PM (#17580340)
Are you thinking about Robert Forward's "Dragon's Egg"? The aliens live on the surface of a neutron star passing through the Solar System, and the "chemistry" on the surface of the neutron star is much faster than our chemistry, consequently the aliens' society evolves much quicker.
Re:Ask HN: What was the name of this Sci-Fi book? by meridion on Saturday July 21, 2018 @10:29AM (#17582101)
Thank you, that was the one!
Re:Ask HN: What was the name of this Sci-Fi book? by mindcrime on Friday July 20, 2018 @09:35PM (#17580259)
Could you be thinking of this comment:

https://news.ycombinator.com/item?id=17392748

("The Dark Forest" by Liu Cixin)

or maybe this one:

https://news.ycombinator.com/item?id=17391451

("Aurora" by Kim Stanley Robinson)

If not, I'd poke around some more looking for the reference in this thread:

https://news.ycombinator.com/item?id=17389842

or maybe this one:

https://news.ycombinator.com/item?id=17302924