AstrotalkUK

Not for profit website/blog on astronomy, space and my writing

Episode 107 – SETI’s new tool – Technosignatures

By Leave a Comment

Episode 107 – Dr Hector Socas-Navarro

The Great Wall of China can be seen from space. Actually, it can’t but the idea that a civilisation could build something large on a planetary scale that could be detected from interstellar distances was articulated first by author Olaf Stapledon in 1937 and popularised by Freeman Dyson in the 1960s. Known today as a Dyson Sphere, it is a megastructure built by an alien intelligence that captures almost all the energy emitted by its star. In this episode, Dr Hector Socas-Navarro explains we humans are not there yet but the increasing density of the Earth’s geosynchronous orbit will become detectable in a couple of centuries.

So not yet a Dyson sphere but a ring or a belt, he calls the Clarke-Exobelt may allow alien civilisations to detect humanity’s presence over interstellar distances. In this episode, we discuss the opportunities for SETI to detect artificial structures like this at interstellar distances using the JWST and very large Earth-based telescopes coming online soon.

Links to the resources we discuss are on the episode webpage

Podcast – Museum of Science and the Cosmos of Tenerife
NASA Technosignatures: “Moderately advanced” technologies in transit. Youtube video
Instituto de Astrofísica de Canarias
Museum of Tenerife

Scientific papers

Podcast: Play in new window | Download (Duration: 40:25 — 92.5MB) | Embed

Subscribe: Apple Podcasts | Google Podcasts | Spotify | RSS | More

Episode 106 – ESA’s new science missions

By Leave a Comment

Pau McNamara

European Space Agency’s Dr Paul McNamara was studying low-frequency gravitational waves just before they were discovered in 2015. Now he is the astronomy and astrophysics coordinator for the European Space Agency. In this interview, recorded in Athens during Cospar2022, he speaks about some of the exciting science missions that ESA will be launching later this decade.

These missions include

  • Juice – JUpiter ICy moons Explorer
  • Euclid – To explore dark matter and dark energy
  • Plato – The next-generation planet-hunting mission
  • Ariel – A UK-led mission to explore the atmospheres of exoplanets

He also talks about ESA’s publicly available resources especially useful to science educators. Planetary Science Archive and ESA Sky. They are available to anyone, in or outside Europe and without charge. Links are available on this episode’s web page.

Dr Paul McNamara

Podcast: Play in new window | Download (Duration: 43:00 — 98.4MB) | Embed

Subscribe: Apple Podcasts | Google Podcasts | Spotify | RSS | More

Episode 100 Sandra Benitez Herrera – ESA Education Outreach

By Leave a Comment

Astrophysicist Sandra Benitez-Herrera  talks about the opportunities for teachers and students made available by the European Space Agency‘s CESAR (Cooperation through Education in Science and Astronomy Research) program. This episode was recorded in Athens in July during Cospar 2022.

If you are a student or a teacher in Europe or beyond, Sandra explains how you make use of CESAR’s resources – optical, solar and radio telescopes, online seminars, face-to-face training and an enormous quantity of space data from ESA and other space agencies. All in one place and with no charge. She starts with an explanation of what CESAR is – in audio and Youtube video below.

Podcast: Play in new window | Download (Duration: 27:08 — 31.2MB) | Embed

Subscribe: Apple Podcasts | Google Podcasts | Spotify | RSS | More

Episode 95 European Space Cooperation DeGaulle to ExoMars with Brian Harvey

By Leave a Comment

The latest book from author Brian Harvey @BrianHarveyAut1, this is probably the first English language analysis of the individuals, institutions and early space projects that would eventually lead,  not just France, but Europe to its status as a leader in designing, building and operating complex space infrastructure. 

This is probably the first English language analysis of the individuals, institutions and early space projects that would eventually lead,  not just France,  but Europe to its status as a leader in designing, building and operating complex space infrastructure.

In the first chapter, “Early Days”, the author refers to John F. Kennedy’s little-known but perhaps most powerful speech on 10 June 1963, Strategy for Peace. Here it would have been interesting to see the author’s assessment on how collaboration in space has cultivated peace on Earth.

In this episode Brian talks about his motivation for writing this book and accessing the complex sources he needed to tell this story.

Podcast: Play in new window | Download (Duration: 1:03:07 — 86.7MB) | Embed

Subscribe: Apple Podcasts | Google Podcasts | Spotify | RSS | More

A video of this interview is available on Youtube.