Uploaded January 2024 | Updated September 2026, 2 weeks ago
Guest Speaker: Dr. Maggie Lieu, Astrophysicist and Research Fellow, University of Nottingham, UK.
Summary: In this webinar, Dr. Lieu begins by explaining how the universe is composed of 5% baryonic matter (i.e., matter that is visible), 27% dark matter, and 68% dark energy. Astrophysicists do not as yet know what dark matter is. They know that it is there because of how fast galaxies are moving. They appear to move too quickly, for the amount of mass is observable and should be flying off. However, they do not, meaning that either our understanding of gravity is wrong or there is more matter in the galaxy than is directly observable. At CERN, many particle physicists are conducting experiments to find a dark matter particle. To date, they have not succeeded. If nothing is found, it could be that our theory of gravity is wrong. More recently, astrophysicists have been using gravitational lensing to determine where dark matter is.
If you are interested in astrophysics and studies on dark matter, this video is for you! We hope you enjoy it!
Euclid Space Telescope https://www.esa.int/Science_Exploration/Space_Science/Euclid
Dr. Lieu’s YouTube channel Space Mog youtube.com/c/SpaceMog
iTelescope itelescope.net
Chapters
0:00 Introduction
3:34 Pie chart … components of the universe
6:10 Dark matter overview
7:25 Vera Rubin … dark matter
9:00 Direct detection experiments
12:10 How can we see dark matter?
17:40 Using galaxy clusters to see dark matter
22:35 Simulation of gravitational lensing by galaxy cluster
26:32 Weak gravitational lensing
30:29 Shear profiles
31:38 Looking for tiny changes
32:25 Euclid Space Telescope
35:10 Total contribution of a galaxy cluster’s mass
36:05 Particle cross-sections of clusters
36:44 Dark matter simulation
37:38 Dark matter determines the fate of the universe
39:53 Audience Questions and answer
#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology
Guest Speaker: Dr. Maggie Lieu, Astrophysicist and Research Fellow, University of Nottingham, UK.
Summary: In this webinar, Dr. Lieu begins by explaining how the universe is composed of 5% baryonic matter (i.e., matter that is visible), 27% dark matter, and 68% dark energy. Astrophysicists do not as yet know what dark matter is. They know that it is there because of how fast galaxies are moving. They appear to move too quickly, for the amount of mass is observable and should be flying off. However, they do not, meaning that either our understanding of gravity is wrong or there is more matter in the galaxy than is directly observable. At CERN, many particle physicists are conducting experiments to find a dark matter particle. To date, they have not succeeded. If nothing is found, it could be that our theory of gravity is wrong. More recently, astrophysicists have been using gravitational lensing to determine where dark matter is.
If you are interested in astrophysics and studies on dark matter, this video is for you! We hope you enjoy it!
Euclid Space Telescope https://www.esa.int/Science_Exploration/Space_Science/Euclid
Dr. Lieu’s YouTube channel Space Mog youtube.com/c/SpaceMog
iTelescope itelescope.net
Chapters
0:00 Introduction
3:34 Pie chart … components of the universe
6:10 Dark matter overview
7:25 Vera Rubin … dark matter
9:00 Direct detection experiments
12:10 How can we see dark matter?
17:40 Using galaxy clusters to see dark matter
22:35 Simulation of gravitational lensing by galaxy cluster
26:32 Weak gravitational lensing
30:29 Shear profiles
31:38 Looking for tiny changes
32:25 Euclid Space Telescope
35:10 Total contribution of a galaxy cluster’s mass
36:05 Particle cross-sections of clusters
36:44 Dark matter simulation
37:38 Dark matter determines the fate of the universe
39:53 Audience Questions and answer
#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology
