The Star Spot

Feature Guest: Anne-Marie Weijmans

Dark matter and galaxies turn out to live together as intimate partners. What role did dark matter play in the formation, characteristics and subsequent evolution of galaxies in our universe? And what do our studies of galaxies in turn teach us about the nature of dark matter haloes? To help answer those questions, Dr. Anne-Marie Weijmans joins Justin Trottier at the Star Spot.

The two touch on tantalizing and little known discoveries. Evidence of ancient dwarf galaxy mergers from the movement of stars in our galaxy. Dark matter in our own solar system. And the previously empty space between galaxies turns out to harbor dark matter haloes extending between galactic islands.

Current in Space

Victoria Duncan shares new data from the Mars Reconnaissance Orbiter focused on the Mars northern lowlands showing evidence of fossilized water channels and even an ancient river delta. Jessica Campbell on what we’re learning about how dark holes accrete mass and grow by studying gas around the Milky Way’s own supermassive black hole. And Denise Fong asks, Where are all the waves on Saturn’s larget moon, Titan?

About Anne-Marie Weijmans

Dr. Anne-Marie Weijmans is Fellow at the Dunlap Institute for Astronomy and Astrophysics at the University of Toronto. This summer 2013 she is working as lecturer at the school of physics and astronomy at the University of St. Andrews in Scotland. Her specialty is in galactic dark matter haloes. She is part of a project to use Sloan Digital Sky Survey data to look deep within galaxies, to map velocities of stars and gas within 10,000 nearby galaxies, as part of these studies. Dr. Weijmans is also keenly interested in education and public outreach. She set up the first Dutch Astronomy Olympiad for high school students, helps run workshops to improve science communication skills, and gives frequent public talks on those topics for which she is passionate: galaxies and dark matter.

Direct download: Ep34-AnneMarieWeijmans.output.mp3
Category:general -- posted at: 9:00pm EDT

Feature Guest: James Robert Brown

We talk a lot at The Star Spot about space, but what, exactly, is space, or time for that matter, and how is it we can know anything at all about our universe and its laws. Some have pronounced the death of philosophy at the hands of science. But are rumours of the discipline's death greatly exaggerated? Philosopher of science James Robert Brown joins Justin Trottier at The Star Spot to discuss the history and philosophy of astronomy.

After introducing the work of philosophy of science, Brown describes the pervasive nature of arguments over the basic nature of space and time, defends Platonism, speaks to the odd power of thought experiments, and provides an update from the frontlines in the Science Wars. Brown also assures us why we should not worry over new attempts to rehabilitate the reality of time. The passage of time is still an illusion after all!

Current in Space

Denise Fong and Jessica Campbell discuss new insight into space wind and why it should matter to you, plus what we're learning from the leftovers of supernovae 1987A in the Large Magellanic Cloud.

About James Robert Brown

James Robert Brown is philosopher of science and mathematics in the Department of Philosophy at the University of Toronto. He is the author of many excellent books including The Laboratory of the Mind: Thought experiments in the natural sciences, Smoke and mirrors: how science reflects reality, and Who Rules in Science: An opinionated guide to the wars. His diverse interests include scientific realism, platonism, foundations of physics and the relationship between science and politics, religion and commercialization.

Direct download: Ep33-JamesRobertBrown.output.mp3
Category:general -- posted at: 9:00pm EDT