Dear Cold-Callers - If you don't know that it's currently winter in the Southern Hemisphere, I am very unlikely to get beyond the first line of your email. Cheers - Geraint
Geraint F. Lewis
@cosmichorizons.bsky.social
Cosmologist & Galactic Archaeologist at @Sydney_Uni. Proud Silurian, Australian immigrant, & author of books about the strange universe we find ourselves in!
Thanks for the warm welcome on a very chilly night at Balmain Library. A great turnout, with great questions, about how we understand the nature of reality.
Pleased to announce that one of my books has been translated into Turkish! If you are in Türkiye, enjoy!!!
In Sydney for National Science Week? You might be interested in this @sydney.edu.au talk with astrophysicist Geraint Lewis @cosmichorizons.bsky.social and chemist Haihui Joy Jiang. Thursday 20 Aug 6:00 pm Register here: www.sydney.edu.au/science/news... 🧪 ⚛️ 🔭
The Impact Factor: Matter of origin
Have you ever wondered how we got here? How our Universe formed? And how life on Earth began? Join University of Sydney researchers, astrophysicist Professor Geraint Lewis and chemist Dr Haihui Joy Ji...
sydney.edu.au
I recently appeared in Petr Lebedev's new video on Cosmic Fine-tuning. youtu.be/oi91kE_wocs?...
The Most Controversial Idea In Physics
YouTube video by SciencePetr
youtu.be
Unsolicited conference advice - please talk to the audience, not your slides, and stop waving the laser pointer around like a light sabre. Use it only when you really need to point something out on a slide. Oh, and you don’t have to be stuck in monotone mode.
My book, The Shortest History of Reality, publishes in North America on October 6! Preorders are 25% off at Barnes & Noble with code PREORDER25. Four days only, so don’t wait! #BNPreorder
Want to hear me in conversation with Dr Karl about just what reality is and how it all works? Then join us at Chatswood Library on 18th July.
Charles Darwin on his student days at Cambridge University.
Winter is coming, but physics still does it's thing.
spacedaily.com/d-the-sun-mi... The sun doesn't look yellow, except on the horizon. It is white, as any wearer of white clothes on a sunny day can easily demonstrate.
The Sun might look yellow, but seen from space without an atmosphere filtering its light, the sun is actually white — and the yellow color we see from Earth is the result of our atmosphere scattering ...
The Sun is depicted as yellow in children’s drawings, in weather icons, on flags, and in the standard astronomical shorthand. Astronomers themselves classify it as a “yellow dwarf,” a G2V-type main se...
spacedaily.com
Lovely photo of the Milky Way from Tumut (taken by my eldest)
To be released in Australia next month, and the US in October, my new book has taken physical form! #ScienceBooks #Cosmology #Astronomy #PopularScience #Books
I was on a panel discussing technology and the future at the Sunshine Coast Hinterland Writers' Festival in Maleny
I am at that grant writing stage where I am minutely adjusting figure size and deleting words almost at random to make things fit.....
Earlier papers on cosmological time dilation would use the word dilatation instead. Whilst they mean the same, I am glad the field has settled on dilation. #astrosci
Are you going to be on the Sunshine Coast in May? Do you want to hear me warble on about science and technology? Have I got the event for you!
Time to start advertising my next book to be released in Australia at the end of June (right cover) and the US in September (left cover). A most wonderful Christmas present! #scicomm #physics #cosmology #science
I think it's interesting that people tell you that rockets can be used in space because of conservation of momentum, and so you don't need an atmosphere to push against, but if you ask them how and where the force is applied to the rocket, they just give you a quizzical look.
New paper on the arXiv - first by PhD student Tim Adams arxiv.org/abs/2602.17957
A Bayesian Exploration of the Mass of Ursa Major III: Kinematics, Rotation and their influence on the Mass to Light Ratio
We investigate the kinematics of the potential ultra-faint dwarf galaxy (UFD) UMa III/U1 using Bayesian inference to search for the signal of any potential intrinsic rotation. The magnitude of rotatio...
arxiv.org
My haul from the excellent Wyrdbooks in Wentworth Falls
