astro[sound]bites astrosoundbites

How fast is the universe expanding? It turns out this important value, the Hubble constant (H0), is under constant debate. The two main teams have numbers that disagree by over 5 standard deviations! Today on a[s]b, we resolve the Hubble tension once and for all, as Cormac and Kiersten square off in the Great H0 Debate. Cormac comes in with feist and facts while Kiersten engages with rebuttal and reason. In the end, there can only be 1 winner, and that’s for you to decide! Vote here for the winner of the debate, what the true value of H0 should be, and what we got wrong in the episode (we tried our best!). https://forms.gle/3dybtrhysS9Lvia37
 
Timeline of the Hubble tension: https://miro.medium.com/v2/resize:fit:1400/format:webp/1*oekTYTkZQmw7DxzUaLqDVw.png
 
Astrobites used for this episode: 
https://astrobites.org/2016/04/20/conflicts-between-expansion-history-of-the-local-and-distant-universe/
https://astrobites.org/2020/05/12/magnets-and-hubble/
https://astrobites.org/2021/04/01/south-polarization/
https://astrobites.org/2021/04/27/bursting-the-hubble-trouble-bubble-measuring-h0-with-fast-radio-bursts/
https://astrobites.org/2023/03/29/multi-messenger-constraints-on-the-hubble-constant/
https://astrobites.org/2023/10/04/holy-cow-is-our-journey-through-the-universe-the-reason-for-the-hubble-tension/
https://astrobites.org/2024/04/16/sn_h0pe/
 
Space sound: https://www.system-sounds.com/earth-day/. Credit: SYSTEM Sounds/Matt Russo/Andrew Santaguida
 
Article by Subir Sarkhar: https://inference-review.com/article/heart-of-darkness
 
Cool Wikipedia page Will references: https://en.wikipedia.org/wiki/Numeral_prefix
 
Chart Kiersten references: https://en.wikipedia.org/wiki/Cosmic_distance_ladder#/media/File:Extragalactic_Distance_Ladder_en.svg

In this episode, we hear about Kiersten and Will’s epic adventures in both hemispheres! Both Kiersten and Will watched the eclipse that passed through North America on April 8, 2024 and are still buzzing with excitement. Kiersten tells us about a recent paper that explores why planets might act so indecisive about sitting between being a super-Earth or mini-Neptune. Will’s astrobite describes a similarly chaotic exoplanetary tale about a very slow moving planet which “came in like a wrecking ball” and “never hit habitability so hard” (everything in quotations must be sung in Miley Cyrus’ singing voice). All in all, we all share a laugh and an emotionally charged episode!

Kiersten’s astrobite: https://astrobites.org/2024/03/28/template-post-22/
Will’s astrobite: https://astrobites.org/2024/03/06/exoplanet-hr-5183-b/
 
Eclipse XKCD: https://www.explainxkcd.com/wiki/index.php/2914:_Eclipse_Coolness
Eclipse Astronomy Photo of the Day: https://apod.nasa.gov/apod/ap240409.html
Sonification: https://www.youtube.com/watch?v=8al9FRz-VKY
Sonification description: https://www.exploratorium.edu/eclipse/listen-eclipse
Miley Cyrus’ “Wrecking Ball” music video: https://www.youtube.com/watch?v=My2FRPA3Gf8

In celebration of the a-bit-over-a-week after St. Patrick’s (definitely not Patty’s) Day, we bring you another Ireland-related episode. Due to historically unsupported stereotypes about the Irish being lucky, we bring you two astrobites busting with cosmic coincidences and a dash of luck. Kiersten tells about a plucky planet that avoided a hangry host star,  while Will brings us yet another binary black hole bonanza. Cormac shares a bit of an infamous Irish space sound that you could call cosmic comic relief.  In the spirit of luck, we talk about the role of luck in our own journeys to space and in the field of astronomy as a whole.
 
This week’s “space sound” - https://www.tiktok.com/@ladbibleireland/video/7278649311334780192?lang=en
 

In celebration of St. Patrick’s (not Patty’s) Day, we share a super short sneak peek at next week’s episode, featuring fun Irish astronomical facts. We’re calling it the Shamrock Shake-up! In addition to the astronomical facts, Will takes us on a journey to the past with some wild Irish lore of his own! We hope you enjoy what might be our first “Beyond the beyond” episode, and Lá Fhéile Pádraig faoi mhaise daoibh go léir!
 
Intro music excerpt: “Granny hold the candle while I shave the chicken’s lip” - Bodega
https://www.youtube.com/watch?v=Fz4IxFy27dw

We talk about gravitational waves again, but this time, in ways you wouldn’t expect. Cormac tells us how you could use gravitational waves to study the interior of the Sun, if the alignment is just right. Sabrina explores whether gravitational waves could be detected by Earth’s magnetosphere through the Gertsenshtein effect. Simultaneously, we learn that Sabrina knows how to pronounce Russian names properly and Will isn’t the biggest fan of theory. 
 
Astrobites:
https://astrobites.org/2023/06/20/using-planetary-magnetospheres-to-detect-gravitational-waves/
https://astrobites.org/2023/11/11/using-gravitational-waves-to-peer-inside-of-the-sun/
 
Additional thematic material:
https://astrobites.org/2023/02/08/detecting-gravitational-waves-with-the-moon/
https://astrobites.org/2022/12/22/gravitational-wave-parallax/
https://www.sciencedirect.com/science/article/pii/S0273117723009171?via%3Dihub
 
Space sound: https://www.nasa.gov/solar-system/sounds-of-the-sun/
Ultra-high-frequency gravitational wave conference: https://www.ctc.cam.ac.uk/activities/UHF-GW.php

In the second episode of the astro[sound]bites series focusing on Indigenous astronomy, we interview Duane Hamacher, a physics professor at the University of Melbourne and a world leading researcher in Indigenous astronomy. Duane shares his journey from Missouri to pursuing a PhD in Australia and immersing himself in the study of astronomy within the Torres Strait community, learning from Indigenous knowledge holders. He tells us how Indigenous peoples around the world have seen astronomy more as a way of life that’s embedded in their culture. Through our discussion, we challenge common misconceptions and gain insight into the profound significance that Indigenous astronomy has held for humanity, long preceding the invention of telescopes. However, our interview only scratches the surface of the field of Indigenous astronomy.
 
Thank you to Prof. Duane Hamacher for taking the time to be interviewed for this episode! (Also sorry for the construction noise in the background of this episode! We hope the exciting interview makes up for it.)
 
Duanes’ book The First Astronomers: https://www.thefirstastronomers.com/