Uploaded February 2023 | Updated September 2026, 3 weeks ago
Guest Speaker: Katya Gozman, Ph.D. candidate, University of Michigan
Summary: In this video, you will learn why and how astronomers study ultra-faint dwarf (UFDs) galaxies. Katya begins by giving us a modern definition of a galaxy, given new findings from the HST and JWST. Dwarf galaxies range from having only a few hundred stars to a few billion stars. UFD galaxies are the least luminous galaxies. They are so faint that astronomers struggle to determine what stars belong to the galaxy and are not, in fact, background stars. UFDs are metal-poor and least chemically evolved (i.e., a few elements higher than hydrogen and helium). They tend to be dark matter dominated, which explains how they retain their shape even when they have very few stars. In the video, Katya explains galaxy evolution and mergers of various galaxies and what can be expected from the deployment of the Vera Rubin Telescope and the Roman Space Telescope.
If you are interested in the evolution of galaxies and UFDs, this video will help you answer some of these questions. We hope you enjoy this video!
iTelescope itelescope.net
Chapters
0:00 Introduction
2:59 Galaxy background information
5:50 The 1920 great debate
8:44 Edwin Hubble
11:25 Hubble deep field
12:25 Poll questions
18:18 Small and Large Magellanic Clouds
19:44 Sculptor and dwarf galaxy discovery
22:36 Ultra-faint dwarf galaxies
33:22 Galactic LEGOs — galaxy mergers
39:35 Galaxy merger simulation
41:22 What is a stellar halo?
44:03 Subaru Telescope & Hyper Supreme-Cam
45:08 M94
48:11 Looking ahead
#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology
Guest Speaker: Katya Gozman, Ph.D. candidate, University of Michigan
Summary: In this video, you will learn why and how astronomers study ultra-faint dwarf (UFDs) galaxies. Katya begins by giving us a modern definition of a galaxy, given new findings from the HST and JWST. Dwarf galaxies range from having only a few hundred stars to a few billion stars. UFD galaxies are the least luminous galaxies. They are so faint that astronomers struggle to determine what stars belong to the galaxy and are not, in fact, background stars. UFDs are metal-poor and least chemically evolved (i.e., a few elements higher than hydrogen and helium). They tend to be dark matter dominated, which explains how they retain their shape even when they have very few stars. In the video, Katya explains galaxy evolution and mergers of various galaxies and what can be expected from the deployment of the Vera Rubin Telescope and the Roman Space Telescope.
If you are interested in the evolution of galaxies and UFDs, this video will help you answer some of these questions. We hope you enjoy this video!
iTelescope itelescope.net
Chapters
0:00 Introduction
2:59 Galaxy background information
5:50 The 1920 great debate
8:44 Edwin Hubble
11:25 Hubble deep field
12:25 Poll questions
18:18 Small and Large Magellanic Clouds
19:44 Sculptor and dwarf galaxy discovery
22:36 Ultra-faint dwarf galaxies
33:22 Galactic LEGOs — galaxy mergers
39:35 Galaxy merger simulation
41:22 What is a stellar halo?
44:03 Subaru Telescope & Hyper Supreme-Cam
45:08 M94
48:11 Looking ahead
#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology
