How do we know what things in space are made from?

09/10/20 • 20 min

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This is episode 60 of the Urban Astronomer podcast! Is that a milestone? Sure, but we'll save the party hats for episode 75. Today we'll just get on with the job at hand, and bring you a science explainy bit. Today's question: How can astronomers be so certain about what things in space are made from? On Earth it's relatively easy to send geologists out to different places with their hammers, and have them collect samples from interesting rock formations and bring them back to the lab for analysis, but astronomers hardly ever get to do that with planets, comets, the Sun and distant galaxies. So how do they know, and how can they sound so confident? Listen below to find out!

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This episode of the Urban Astronomer Podcast features an interview with Dr Imogen Whittam, an astrophysicist at Oxford University

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Interview with Dr Julia Healy

This episode features an interview with Dr Julia Healy, from ASTRON, where she works as part of the MHONGOOSE survey team. When this interview was originally recorded early last year, she hadn't yet submitted her PhD thesis, but has since graduated and earned the title "Dr". Julia completed her Bachelor of Science, specialising in Astrophysics and Physics, at the University of Cape Town in 2013. She went on to complete a Bachelor of Science Honours in Physics in 2014 and a Master of Science in Astronomy in 2017, also at UCT. In 2017 she began a double degree PhD programme at the University of Cape Town and the University of Groningen (in the Netherlands), which she submitted in March 2021 and later defended in a public ceremony in Groningen in August 2021. I am now a postdoctoral fellow based at ASTRON (the Dutch National Radio Observatory) working as part of the MHONGOOSE survey team. The MHONGOOSE (MeerKAT HI Observations of Nearby Galactic Objects: Observing Southern Emitters) survey is one of the large survey project run on the MeerKAT radio telescope.