Geraint F. Lewis
@cosmichorizons
Cosmologist & Galactic Archaeologist at @Sydney_Uni. Proud Silurian, Australian immigrant, & author of books about the strange universe we find ourselves in!
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.
New paper with my old student, Brendon Brewer - arxiv.org/abs/2606.01496
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
The Torres Straight has their own flag - They are Melanesian, not Australian Aboriginal.
Whilst I love dinosaurs, my favourite period is the Cambrian!
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
I read about the Storegga Slide and end of Doggerland years ago in this book, published about 20 year ago.
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!
Interesting perspectives on cosmology from Virginia Trimble in 1983. #astrosci
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.
There's no obvious reason for choosing that metric signature!
I made this for my PhD (sometimes last century), which shows microlensing in the Einstein Cross. It's still out there, being used :) - hyperphysics.phy-astr.gsu.edu/hbase/Astro/...
The line of totality in 2028 passes a few hundred metres from my School of Physics at the University of Sydney.
Just finished Heroes (really enjoyed) and about to start Mythos (have Troy and the Odessey lined up).
Tim Berners-Lee talking about the invention of the world wide web at the Sydney Opera House last night. An invention that truly changed the world.
My airplane display has the Milky Way aligned with the Earth's equator and this really bothers me.