S27E140: Sagittarius A* Controversy, Titan's Methane Clues, and Ozone Recovery Insights

SpaceTime with Stuart Gary

SpaceTime Series 27 Episode 140
*Revisiting the Milky Way's Black Hole Image
A new study questions the accuracy of the first-ever image of Sagittarius A, the supermassive black hole at the centre of the Milky Way. Researchers suggest the image may not accurately represent its appearance, proposing a more elongated accretion disc instead of the ring-like structure previously released by the Event Horizon Telescope.
*Methane in Titan's Crust
Data from NASA's Cassini spacecraft indicates that Saturn's moon Titan may have a methane-rich crust up to 10 kilometres thick. This insulating layer could explain Titan's shallow impact craters and its methane-rich atmosphere, providing insights into its unique geological and atmospheric dynamics.
*Updates on Earth's Ozone Hole
NASA reports that the annual ozone hole over Antarctica was smaller this year, ranking as the seventh smallest since recovery efforts began. The ozone layer is on track to fully recover by 2066, thanks to international agreements curbing ozone-depleting chemicals.
The Science Report
Antarctic ice core samples suggest Earth has already surpassed a 1.5°C global temperature rise due to human-induced climate change. A study links outdoor lighting at night to increased Alzheimer's risk for those under 65. LED lights on surfboards could reduce shark attacks by mimicking natural camouflage. Nord's latest survey reveals continued use of weak passwords, with "123456" and "password" among the most common.
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00:00 New study suggests first ever picture of Milky Way's black hole might not be accurate
00:47 New study claims first ever images of Sagittarius A may be inaccurate
03:57 New study suggests Saturn's moon Titan may have an insulating methane crust
09:12 Scientists say Antarctic ozone layer could fully recover by 2066
20:04 New study suggests Earth has already passed 1.5 degrees Celsius warming attributable to climate change
21:24 A new study claims exposure to outdoor lighting at night increases Alzheimer's risk
25:29 Space Time with Stuart Gary is available on numerous podcast platforms