42: BONUS – White holes, astrology and why is Venus so hot?
Jul 6, 2023
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This podcast explores topics such as white holes and their potential appearance above Earth, cultural differences in constellation representations, the reasons behind Venus being hotter than Mercury, the presence of ice on Mercury, and the hosts' choices for a celestial object to replace the Moon in the Earth's sky.
Different cultures around the world have similar star patterns and constellations, indicating intriguing similarities in constellations across cultures.
Venus is hotter than Mercury due to its thick atmosphere, which traps heat from the sun and creates a greenhouse effect.
Deep dives
Similarities in Constellations Across Different Cultures
Different cultures around the world have similar star patterns and constellations. For example, Australian Aboriginal representations of constellations include star patterns like Orion, which is also recognized as a hunter, similar to Greek mythology. Despite being separated by thousands of years and kilometers, this indicates intriguing similarities in constellations across cultures.
The Split Between Astronomy and Astrology
Astronomy and astrology used to be intertwined until about 400 years ago when scientific discovery, particularly the invention of the telescope, led to the understanding that planets were real worlds. While figures like Galileo and Tycho Brahe believed in astrology, the practice gradually faded in the second half of the 17th century, partly due to dismissive views from religions like Christianity and Islam. Astrology is now considered a pseudoscience, and it can be explained to people by pointing out its lack of scientific evidence and comparing it to fun, fictional elements like Hogwarts houses.
Why Venus is Hotter than Mercury
Despite being closer to the sun, Venus is hotter than Mercury due to its thick atmosphere. The atmosphere of Venus, filled with smog and carbon dioxide, traps heat from the sun, causing temperatures to rise and creating a greenhouse effect. On the other hand, Mercury has no atmosphere and its surface reflects the sunlight, preventing the buildup of heat. Additionally, the detection of ice on Mercury's poles suggests that areas in permanent shadow can remain extremely cold.
White Holes: Hypothetical and Theoretical
White holes are completely hypothetical and have yet to be detected. They are considered the opposite of black holes, where nothing can enter a white hole and all matter can only escape from it. Theoretical research is being conducted to understand how white holes would be described within the framework of Einstein's general relativity, particularly in relation to singularities. However, the concept of white holes remains highly theoretical, and there is no evidence of their existence or any observations of white holes through telescopes.
What’s a white hole and could one appear above the Earth tomorrow? Do different cultures sort stars into similar patterns? Why is Venus so hot and how do the Supermassive team cope when someone calls them an astrologer?
Dr Becky Smethurst and Dr Robert Massey take on your questions from the Supermassive mailbox.
Send your questions to podcast@ras.ac.uk, tweet @RoyalAstroSoc, or find us on Instagram @SupermassivePod.
The Supermassive Podcast from the Royal Astronomical Society is a Boffin Media Production. The producers are Izzie Clarke and Richard Hollingham.
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