MOND (Modified Newtonian Dynamics), with video by Sabine Hossenfelder PhD. Presented by John Bobbitt

Galaxies do not appear to obey the currently understood laws of physics. Newton's Laws predict that stellar rotation velocities should decrease with distance from the galactic centre, but in the 1970s US astronomer Vera Rubin found instead that they remain almost constant. This necessitates at least one of the following:

(1)    There must be large quantities of unseen matter in galaxies which boosts their stars' velocities beyond what would be expected based on the visible mass alone, or

(2)    Newton's Laws do not apply to galaxies.

Option (1) leads to the dark matter hypothesis; option (2) leads to Modified Newtonian dynamics (MOND), a modification of Newton’s Gravitational Law and an alternative to the hypothesis of dark matter.

Adult Discussion Group will be meeting in person @ 9:45AM in Thoreau’s Clark Cabin except on the third Sunday of each month when we will meet in the Sanctuary @ 11AM.

Masks are now optional. The AC and HEPA filter will be running to keep Clark Cabin & the Sanctuary as safe as possible.

For those that prefer: We will provide ZOOM via the OWL system when we meet in the cabin & our Moderator Tamara will recognize your hand up and add you to the queue.

On the Third Sunday our 11AM presentation will be via Facebook.

Thoreauvians and friends will be notified each week (tuucannounce@groups.io) of our ADG topic, time and zoom login.
Please keep an eye out for our notices.

Interested in joining this discussion? Get in Touch!