Watching a Red Supergiant Explode @itelescopewebinars

Uploaded February 2023 | Updated September 2026, 2 weeks ago

Guest Speaker: Wynn Jacobson-Galan, NSF Graduate Fellow, Ph.D. candidate, UC Berkeley

Summary: In this video, you will learn about: the evolution of supergiant stars, what supernovae are, and the story of Supernova SN 2020TLF. Wynn provides a simple definition of a star “as a self-contained sphere of hot gas that is fusing its hot gas to make different hot gas.” Supernovae can be thought of as the endpoints of massive stars and compact stars. Stellar explosions can be very diverse, from collapsing massive stars to merging white dwarfs to merging neutron stars and a white dwarf that gobbles gas from a main sequence star. Wynn finally explains that he is a member of the Young Supernova Experiment (YSE) that surveys 1512 deg2 of the sky every 3 days to detect new supernovae. YSE detected SN 2020TLF in 2020, which is the first supernova for which astronomers had detected the activity of the progenitor star.
If you are interested in the evolution of stars and supernovae, this video will help you elucidate their evolution. We hope you enjoy this video!

iTelescope itelescope.net
Young supernova experiment https://yse.ucsc.edu
Astronomers see death throes of giant star before violent explosion
https://news.berkeley.edu/story_jump/astronomers-see-death-throes-of-giant-star-before-violent-explosion/

Chapters
0:00 Introduction
3:25 What is a star?
4:37 Stellar lifecycle
5:28 How stars create elements
15:48 Supernova ash
17:24 What is a supernova?
18:25 Stellar explosions are diverse
22:40 Supernova observations
26:21 Find the explosion
32:05 Red supergiant stars
35:15 Red sergeant research at UCB
37:45 Important definitions
39:34 Observing very young supernovae
41:54 Supernova 2020TFL
50:07 What have we learned…summary

#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology

Collapsing Galaxies Creating Black Holes with Dark Matter at Cosmic Dawn

$The Grand Design: How Large Scale Structure Illuminates Cosmology and Particle Physics Title: The Grand Design: How Large-Scale Structure Illuminates Cosmology and Particle Physics– 8-09-2024 Guest Speaker: Abbe Whitford, PhD Student, University of Queensland, Australia. Summary: In this webinar Abbe presents how large-scale structures in the universe, of the order of GPCs (giga-parsecs), can inform scientists on cosmology and the nature of particle physics. She begins by explaining that the study of large-scales structure is important to help determine the distribution of normal matter, dark matter, and the radiation of the early universe, after the big bang. Right after the big bang, the radiation domination epoch began, where most of the energy was in the form of radiation. Over time the radiation decreased, and density of matter increased. As time continued, the dark energy domination epoch began, which is believed to be driving the expansion of the universe. On the other hand, early in the universe it is believed that neutrinos stopped interacting with other particles and started flying freely. Although it was believed that these particles had no mass, now it seems that they might have a small mass. Based on the analysis presented, the mass of neutrinos might have a direct impact on the structure of the universe. If you are interested in the study of cosmology and how it might have been influenced by neutrinos, this video will be for you. We hope you enjoy it! iTelescope https://www.itelescope.net The University of Queensland Australia https://www.uq.edu.au Astrobites.com https://www.astrobites.org/author/awhitford/ Chapters 00:00- Introduction 01:28- Using the Large-scale Structure of the Universe 06:05- Why do we care about the Large-scale Structure of the Universe? 11:39- Part 1: Uncovering the nature of the Universe with the motions of galaxies. 19:07- Poll Question 1 (How fast do you think the peculiar motion can be?) 20:47- Dark Matter Field vs Normal Matter Field 26:02- Poll Question 2 (What fraction of matter do you think is just the dark matter?) 28:57- The bulk flow motions of galaxies 39:33- CosmicFlows 4 dataset 43:22- Part 2: Using the sound waves in the early Universe to understand neutrinos. 44:39- Poll Question 3 (How fast did sound waves move in the early Universe?) 46:43- Sound Waves as Bubbles or BAO’s data results 51:57- How is this related to neutrinos? And firstly, what are neutrinos? 59:36- Questions and Answers #iTelescope #astrophotography #astronomy #astro #deepsky #cosmology$

The Lives and Deaths of Galaxies in the Universe