Spineless sea squirts shed light on vertebrate evolution, and an iodine-fuelled engine powering a satellite in space.In this episode:00:45 A story of sea squirts, ancient vertebrates and missing genesWhen a PhD student set out to study the developmental pathways of a strange sea creature, he hoped to shed light on the origins of vertebrate animals. Instead, researchers found themselves investigating a strange case of missing genes. We hear why gene loss could be a more significant factor in evolutionary processes than was previously thought.Research article: Ferrández-Roldán et al.08:17 Research HighlightsThe unusual crystal that gives a beetle its glittering green sheen, and the genetics of a fish’s 200 year lifespan.Research Highlight: Weird crystal makes beetle a living jewelResearch Highlight: Some of Earth’s longest-lived fish show how to reach extreme ages10:43 An iodine-fuelled engine for satellitesIn space, many satellites use xenon-fuelled ‘electric propulsion systems’ to maneuver. However, xenon is rare and requires high-pressure storage systems, so researchers have been working to develop alternative fuels. This week, a team publish details of the first in-space test of an iodine-powered electric propulsion system, which they say has many advantages over xenon systems.Research article: Rafalskyi et al16:37 Briefing ChatWe discuss some highlights from the Nature Briefing. This time, issues aboard the Hubble Space Telescope, and what the discovery of a theorised mineral reveals about processes deep within the Earth.Wired: NASA Tries to Save Hubble, AgainNature: Diamond delivers long-sought mineral from the deep EarthSubscribe to Nature Briefing, an unmissable daily round-up of science news, opinion and analysis free in your inbox every weekday.
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