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Ask A Spaceman Ep. 181: What Is The Principle Of Least Action?

Release Date: 08/02/2022

Cheap Astronomy - Dear Cheap Astro #117: The Dark Side

The 365 Days of Astronomy

Hosted by Steve Nerlich. Stumbling around in the dark again. What is the latest on dark matter? Well, there’s not much new to report here. The nature and composition of dark matter remains unknown, but the likelihood that there is vast amount of non-interacting, invisible and gravity-inducingly material remains high. Are black holes the source of dark energy? To give you the full story, someone sent a link to an article that claims that black holes are the source of dark energy, along with their actual question which was 'this is just bollocks isn't it’? And yes, it would seem so. Firstly,...

EVSN - Astronomers Discover 63 Galaxies in Protocluster

The 365 Days of Astronomy

From October 29, 2021. (Halloween) Astronomers researching the G237 protocluster find 63 galaxies within, all producing stars and more galaxies at a high rate, acting as a “shipyard” for their region of the cosmos. Plus, Juno looks inside Jupiter’s cloud bands and a review of “Invasion” on AppleTV+ We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs. Just visit: and donate as much as you can! Share the podcast with your friends and send the Patreon link to them too! Every bit helps! Thank you!...

Awesome Astronomy - AstroCamp Spring 2025!

The 365 Days of Astronomy

Paul Hill and Dr. Jenifer “Dr. Dust” Millard host. Damien Phillips, John Wildridge and Dustin Ruoff produce. We come at you with all the fun of AstroCamp in Cwmdu, Wales. Chat, debate and birdsong! We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs. Just visit: and donate as much as you can! Share the podcast with your friends and send the Patreon link to them too! Every bit helps! Thank you! ------------------------------------ Do go visit for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs...

Big Impact Astronomy - Kevin Govender

The 365 Days of Astronomy

Dr. Kevin Govender is the director of the Office of Astronomy for Development and the joint recipient of the Edinburgh Medal together with the International Astronomical Union (IAU). The award was presented in recognition of the creation and practical establishment of the IAU Office of Astronomy for Development. He was born in South Africa, and was trained as an experimental nuclear physicist.[2] He held the post of Manager of the Southern African Large Telescope's Collateral Benefits Programme at the South African Astronomical Observatory, and was appointed director of the Office of...

Ask A Spaceman Ep. 247: Is There Any Other Way to Make Black Holes?

The 365 Days of Astronomy

How do we explain the giant black holes appearing in the young Universe? Is it possible to directly collapse a black hole, skipping the formation of stars? What does ultraviolet radiation have to do with this? I discuss these questions and more in today’s Ask a Spaceman! Support the show: All episodes: Watch on YouTube: Read a book: Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE! Big thanks to my top Patreon supporters this month: Justin G, Chris L, Alberto M,...

Astronomy Cast Ep. 754: K2-18b

The 365 Days of Astronomy

Streamed live on Apr 28, 2025. Hosted by: Fraser Cain and Dr. Pamela L. Gay You’ve heard the news! Astronomers are reporting the discovery of biosignatures at K2-18b. Is this proof of life or should we all be more skeptical? It's in the news and people are claiming aliens... but is it aliens? Let's see what the data actually says. SUPPORTED BY YOU This Episode is made possible thanks to our Patrons on Patreon. Join at the Galaxy Group level or higher to be listed in our YouTube videos. Thanks to: BogieNet, Stephen Vei, Jeanette Wink, Siggi Kemmler, Andrew Poelstra, Brian...

Travelers in the Night Eps. 789 & 790: Asteroid With A Tail & Vivian's Debut

The 365 Days of Astronomy

Dr. Al Grauer hosts. Dr. Albert D. Grauer ( ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. From March 2024. Today's 2 topics: - My Catalina Sky Survey teammate Josh Hogan was asteroid hunting in the constellation of Taurus with our 60 inch telescope on Mt. Lemmon, Arizona when he came across a very curious object. It has an orbit like an ordinary main belt asteroid. However, amazingly it has a tail extending some 19,000 miles out from a few mile diameter central object. - My new Catalina Sky Survey Teammate Vivian...

Last Minute Astronomer - May Episode

The 365 Days of Astronomy

I’m Rob, your Last Minute Astronomer, bringing astronomy to normies and nerds, with little time to spare. We’ll start by talking about this month’s big events, then highlight the naked eye planets, and finish up with the lunar phases, so you can plan ahead better than me. 5th – ETA AQUARID METEOR SHOWER – Around 10-20 meteors per hour if we’re lucky, the Eta Aquarids are a minor shower that favors those in the southern hemisphere. The best time this year is after midnight (when the Moon sets) and before dawn. Just remember each meteor is a piece of debris left...

EVSN - Federal Budget Cuts: An Extinction-level Event

The 365 Days of Astronomy

From April 24, 2025. This week we look at how the elimination of science programs, projects, datasets, and funding may be shaping into an extinction-level event for US Space-related sciences. Come cry with us. We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs. Just visit: and donate as much as you can! Share the podcast with your friends and send the Patreon link to them too! Every bit helps! Thank you! ------------------------------------ Do go visit for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and...

Actual Astronomy - The Observer’s Calendar for May

The 365 Days of Astronomy

Hosted by Chris Beckett & Shane Ludtke, two amateur astronomers in Saskatchewan. Episode 480: May 2 - Vesta at Opposition May 3 - Mars Moon and Beehive May 4 - First Quarter Moon - Lunar X visible on Moon. May 5 - Lunar Straight Wall Visible & Maginus Ray May 6 - Eta Aquarid Meteor Shower Peak - ZHR 50 but usually 30, though in 2013 it reached over 130! From Comet Halley. May 10/11 - Moon passes within ½ degree of Spica all night May 14/15 - Endymion sunset rays visible on Moon May 15 - Titan Shadow Transit Visible May 27 - New Moon - Omega Centauri well placed. May 31 - Venus...

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What makes the principle of least action so important? Who came up with it? Is it all just a bunch of math or does it actually mean something? I discuss these questions and more in today’s Ask a Spaceman!

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Keep those questions about space, science, astronomy, astrophysics, physics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE!

Big thanks to my top Patreon supporters this month: Justin G, Chris L, Barbara K, Duncan M, Corey D, Justin Z, Nate H, Andrew F, Naila, Scott M, Rob H, Justin, Louis M, Paul G, John W, Alexis, Erin J, Jennifer M, Gilbert M, Joshua, Bob H, John S, Thomas D, Michael R, Simon G,David B, Frank T, Tim R, Tom Van S, Mark R, Alan B, Craig B, Richard K, Steve P, Dave L, Stephen M, Maureen R, Stace J, Neil P, COTFM, Stephen S, Ken L, Alberto M, Matt C, Joe R, David P, Ulfert B, Sean M, Edward K, Darren W, Tracy F, Sarah K, Steven S, Ryan L, Ella F, Richard S, Sam R, Thomas K, James C, Jorg D, R Larche, Syamkumar M, John S, Fred S, Homer V, Mark D, Colin B, Bruce A, Steven M, Brent B, Bill E, Tim Z, Thomas W, Linda C, David W, Aissa F, Marc H, Avery P, Scott M, Thomas H, Farshad A, Matthias S, Kenneth D, Maureen R, Michael W, Scott W, David W, Neuterdude, Cha0sKami, Robert C, Matthew K, Robert B, Gary K, Stephen J, dhr18, Anna V, Johanna M, Matthew G, Paul & Giulia S, Ron D, Steven M, Louis M, Michael C, Alyssa K, Lode D, Roger, Bob C, Patti H, Red B, Benjamin M, BlueDragon, Stephen A, Ian S, James R, Skip M, and Robert O!

Thanks to Cathy Rinella for editing.

Hosted by Paul M. Sutter, astrophysicist and the one and only Agent to the Stars: http://www.pmsutter.com

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