AstrotalkUK

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

Episode 108 – NASA’s Europa Clipper Mission

By Leave a Comment

The Europa Clipper mission, due for launch in 2024, will arrive and orbit Jupiter in 2030. The third spacecraft to do so after Galileo (in 1995) and Juno (in 2016). The Pioneer and Voyager missions were flybys. The primary objective, as the mission name suggests, is the investigation of Jupiter’s Moon, Europa. Called Europa-Clipper after the 19th-century merchant ships that shuttled between ports at the high-speed then available.

Europa-Clipper will orbit Jupiter, not Europa. This is one of Jupiter’s moons that shows strong evidence of a sub-surface water ocean. During its four-year mission lifetime it will flyby Europa dozens of times looking for conditions suitable for life.

Dr Steven Vance talks about the mission’s goals and current state of readiness. This was recorded in Athens during Cospar 2022. He was the scientific advisor to the 2013 film Europa Report.

Podcast: Play in new window | Download (Duration: 25:49 — 29.7MB) | Embed

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

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 103 -Observing the Solar System with the JWST

By Leave a Comment

The James Webb Space Telescope has already wowed astronomers and the general public with some incredibly spectacular deep space images. But did you know, NASA has set aside a substantial number of hours for JWST to observe the objects in the solar system? What’s more that programme kicks in this autumn so some images of planets and their moons along with asteroids and comets will be published before the end of this year.

Dr Connr Nixon

A team of astronomers including planetary scientist Dr Connor Nixon will make use of the Guaranteed Time Observations (GTO) to observe the objects in the solar system from Mars and beyond. JWST cannot look towards the Sun so excludes the Earth, Venus or Mercury. The program is led by Dr. Heidi B. Hammel.

In this interview recorded in July during COSPAR2022 in Athens, Connor Nixon talks about the GTO and his role in it looking at Titan.

Podcast: Play in new window | Download (Duration: 35:21 — 28.3MB) | Embed

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

Episode 96 Seti – The search so far with Jill Tarter

By Leave a Comment

Allen Telescope Array. Source Seti.org

The Earth is one ordinary planet of many orbiting one typical sun of many in an unremarkable galaxy, the milky way one of the countless numbers in an ever-expanding universe.

Since the beginning of human civilisation, people have looked up at the night sky and wondered – are we alone? Science and technology of the 20th century has made it possible to try to address that question. So how is are we doing?

What have been the near-misses? How has the search evolved since then what are the current prospects of detecting a signal?

Jill Tarter from @SETIInstitute has worked on a number of major scientific projects, most relating to the search for extraterrestrial life and attempt to answer the question ”Are we alone in the universe.  The 1997 Hollywood film ‘Contact’ starring Jodi Foster was largely based on her work. 

As the former director of the Seti Institute, she explains when Seti research began, the technology used, how it is funded and the global collaborative international endeavour it has now become. 

Podcast: Play in new window | Download (Duration: 35:04 — 28.1MB) | Embed

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

A video of the interview on which this episode is based is available on youtube.