About SFAA Live-streamed Lectures

Once monthly, the SFAA hosts distinguished guest speakers who are leaders in the fields of astronomy, physics and related disciplines. The speakers present to the public and SFAA members the latest developments from cutting-edge scientific programs.   To view archived lectures, click here.

Due to the COVID-19 pandemic,  the monthly lectures are being made available by live stream.  Use your computer or mobile device to connect to the links provided below.


15 December 2021, 7:00 PM, Wednesday, Live-streamed via Zoom, YouTube and Facebook

“Not so Fast Supernova: Highest-Energy Cosmic Rays Detected in Star Clusters”


Ke Fang, Assistant Professor, Dept. of Physics, Univ. of Wisconsin-Madison

It’s not just light we receive from the Universe. We receive cosmic particles on the Earth that have travelled enormous distances at incredibly high speeds. Some of these particles carry extreme energies, millions of times higher than we can achieve using man-made particle accelerators, like the Large Hadron Collider, here on Earth. Half a century after their first discovery, these cosmic rays remain mysterious. Where do they come from? Is there a smoking gun signal from their origin? How does nature manage to accelerate them to such high energies? This talk will tell you about these energetic messengers and what they say about nature’s accelerators, including the star clusters.

Brief Bio

Dr. Ke Fang obtained her doctorate in Astrophysics at University of Chicago in 2015. She worked as a JSI postdoc fellow jointly at University of Maryland and NASA Goddard Space Flight Center from 2015 to 2018. In 2018 she was awarded NASA’s Einstein Fellowship, which brought her to Stanford University in 2018 to pursue her own research program. Earlier this year she moved to University of Wisconsin-Madison as an assistant Professor in the Department of Physics. She pieces together the information we receive from the Universe from a multitude of messengers, including high energy gamma ray radiation, ultra-light particles known as neutrinos, and cosmic rays, to study the extreme activities of the Universe.

How to Attend

To attend the virtual meeting "live" with the opportunity to ask questions:

Connect starting at 6:30pm on Wednesday, December 15th by clicking this Zoom meeting link: https://zoom.us/j/95830904603?pwd=UDNKdm16US9wK1EremdJeGptdjNNdz09

Clicking the link may prompt you to install the Zoom virtual meeting app. Once installed, you will be able to join the meeting. If the app is already installed on your device, simply enter the meeting number 958 3090 4603 and password 116064 to join the meeting.

Once joined, you can test your audio and video, and greet other members.

Board members will join the meeting early to help troubleshoot any problems with audio or video.

"Doors Open" at 6:30pm and the announcements and lecture will start promptly at 7:00pm.

Alternatively, please visit the following channels to attend the live stream:

SFAA YouTube channel: https://www.youtube.com/channel/UChuBJGp_iJYZ11q_ayA-q3A

SFAA Facebook: https://www.facebook.com/groups/152754481404310