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Space Nuts #472 Q&A Edition: Titan's Mysteries and Cosmic Curiosities Join Andrew Dunkley and Professor Fred Watson in this intriguing Q&A episode of Space Nuts, where they delve into the mysteries of our solar system and beyond, addressing questions from their curious audience. From the unique atmosphere of Titan to the hypothetical existence of Planet Nine, this episode is filled with captivating discussions and astronomical insights. Episode Highlights: - Titan's Atmospheric Enigma: Explore the origins of Titan's thick nitrogen atmosphere and its ability to retain it, unlike Mars. Discover the role of comets and organic chemistry in shaping this unique moon's environment. - Tidal Locking Explained: Understand the gravitational phenomenon of tidal locking and why proximity and size matter. Learn about the differences in how natural and man-made satellites maintain their orientation. - Planet Nine Hypothesis: Dive into a speculative theory about Planet Nine and its potential impact on Uranus and Mercury. Discuss the ongoing search for this elusive celestial body. - Triton's Dwarf Planet Status: Uncover the history of Neptune's moon Triton and its possible past as a dwarf planet. Examine the characteristics that make Triton a fascinating world in its own right. - Distinguishing Doppler Effects: Differentiate between Doppler shifts caused by relative motion and the redshift due to the universe's expansion. Explore how these phenomena are used to study cosmic objects. For more Space Nuts, including our continually updating newsfeed and to listen to all our episodes, visit our website. Follow us on social media at SpaceNutsPod on facebook, X, YouTube, Tumblr, Instagram, and TikTok. We love engaging with our community, so be sure to drop us a message or comment on your favourite platform. For more Space and Astronomy News Podcasts, visit our HQ at www.bitesz.com. Become a supporter of this podcast: https://www.spreaker.com/podcast/space-nuts/support or visit our Support page for more options: https://spacenutspodcast.com/about Stay curious, keep looking up, and join us next time for more stellar insights and cosmic wonders. Until then, clear skies and happy stargazing. 00:00 - This is a Q and A episode and we will be doing some homework 01:17 - How come Titan can retain an atmosphere when Mars cannot 07:23 - Why is tidal locking a function of proximity of bound objects 11:00 - Ash Brisbane proposes that Planet Nine once existed on elliptical orbit 14:43 - Nigel from Brisbane Australia asks hypothetical question about Neptune's Triton 18:59 - Triton may have been formed much further out in the solar system 21:17 - Nigel asks where the word asteroid came from 23:24 - Fred answers question from Robert McCowan about Doppler effect ✍️ Episode References Kelly Miller https://www.swri.org Space.com article https://www.space.com/ saturn-moon-titan-makes-own-atmosphere.html 3--- Southwest Research Institute https://www.swri.org iHeartRadio https://www.iheart.com Apple Podcasts https://www.apple.com/apple-podcasts/ Spotify https://www.spotify.com bitesz.com https://www.bitesz.com
Nabije superaarde ontdekt die zich (deels) in de leefbare zone van zijn ster bevindt
Nabije superaarde ontdekt die zich (deels) in de leefbare zone van zijn ster bevindt
Impressie van het systeem van Ross 508. Groen is de leefbare zone van de rode dwergster. (Credit: Astrobiology Center). Japanse sterenkundigen onder leiding van Bun’ei Sato (Tokyo Institute of Technology) hebben bij de rode dwergster Ross 508 een zogeheten superaarde ontdekt, een exoplaneet die vier keer zoveel massa als de aarde heeft. De ster (spectraaltype M4,5) en z’n planeet staan slechts 37…
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Nabije superaarde ontdekt die zich (deels) in de leefbare zone van zijn ster bevindt
Nabije superaarde ontdekt die zich (deels) in de leefbare zone van zijn ster bevindt
Impressie van het systeem van Ross 508. Groen is de leefbare zone van de rode dwergster. (Credit: Astrobiology Center). Japanse sterenkundigen onder leiding van Bun’ei Sato (Tokyo Institute of Technology) hebben bij de rode dwergster Ross 508 een zogeheten superaarde ontdekt, een exoplaneet die vier keer zoveel massa als de aarde heeft. De ster (spectraaltype M4,5) en z’n planeet staan slechts 37…
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Windsnelheid op exoplaneet HD 189733b gemeten: max. 8700 km per uur!
Sterrenkundigen van de Universiteit van Warwick zijn er in geslaagd om voor het eerst de windsnelheid op een exoplaneet te meten, een planeet buiten het zonnestelsel. De exoplaneet heet HD 189733b en hij is al enkele jaren bekend, onder andere door z’n turbulente atmosfeer. Maar nu is die windsnelheid gemeten en die blijkt op HD 189733b gigantisch hoog te zijn: maximaal 8700 km/uur, ruim 2 km/sec, da’s twintig keer hoger dan de hoogste windsnelheid op aarde gemeten. De sterrenkundigen, onder leiding staand van Tom Louden, maten de windsnelheid door met spectroscopen van het HARPS (High Accuracy Radial velocity Planet Searcher) instrument in La Silla in Chili de absorptielijn van het element natrium in de atmosfeer van de planeet te bekijken en meten. Door het Doppler-effect kon men de snelheid van de wind bepalen, wind die van de dagzijde naar de nachtzijde van de planeet waait. De azuurblauwe HD 189733b is een hete Jupiter, een grote gasplaneet die 10% meer massa dan Jupiter heeft en maar liefst 180 keer dichterbij z’n ster staat dan Jupiter bij de zon. Vandaar dat ‘ie bloedje heet is, het is er pakweg 1800 °C aan het oppervlak. Een grote hete luchtoven dus, die HD 189733b. Bron: Sciencedaily.
Astroblogs: http://www.astroblogs.nl/2015/11/13/windsnelheid-op-exoplaneet-hd-189733b-gemeten-max-8700-km-uur/
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I finally understand the Doppler-effect clue from the Big Bang Theory fancy dress party
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