2025 05 10 RASC Halifax May 2025 mtg скачать в хорошем качестве

2025 05 10 RASC Halifax May 2025 mtg

Summary RASC Halifax Astronomy Meeting Summary In the meeting, RASC acknowledged the unceded territory of the Mi'kmagi people and welcomed all with an interest in astronomy. The meeting featured a photo montage of images captured by RASC Halifax members in April, including Messier 5, the moon, and the sun. 02:30 Blair McDonald presented a special presentation on black holes, 10:35 Paul Heath - Food for the Soul - Hidden Star. 1:14:52 The meeting also included Tony McGrath - News from the Board 1:16:57 Peter Hurley - Dark Sky Weekend, and Laser Pointer Training 1:22:47 Judy Black - Nova East and National council update 1:37:24 David Hoskin - What's Up for May 1:54:47 (this upload includes the slides in full screen mode). Zoom AI summary (such as it is): Explaining Black Holes and General Relativity RASC discussed the nature of black holes, explaining that they are not vacuum cleaners of the universe and do not have increased gravitational pull at a distance. He described the life cycle of stars, including their birth from nebulae, fusion, and eventual death as white dwarfs, neutron stars, or black holes. RASC also explained the concept of general relativity, which equates gravity with the force of acceleration and describes space as a dynamic, warped entity. He used a thought experiment involving a window frame, a cannon, and a falling person to illustrate how gravity and acceleration are related. Black Holes: Simplicity and Weirdness Blair MacDonald discussed the simplicity and strangeness of black holes, emphasizing that they consist of only two things: a spherical event horizon and a singularity. Black holes are simple because they can be fully described by three things: mass, charge, and spin. They can't have anything else, as all other information is lost when a black hole forms. RASC also explained the process of virtual particle pairs popping into existence near the event horizon of a black hole, with one particle falling into the black hole and the other becoming a real particle, radiating away as energy. This process causes black holes to slowly radiate away over billions of years. RASC also discussed the weird effects of relativity around black holes, such as time slowing down and the extreme warping of spacetime. He mentioned that black holes can be detected by observing the effects of their accretion disks and jets of material. RASC concluded by discussing recent advancements in black hole imaging, including the first-ever image of a black hole at the center of the galaxy M87, captured by the Event Horizon Telescope. Blair discussed the concept of white dwarfs, explaining that they last forever but eventually cool and disappear. RASC also addressed questions about gravitational fields and the behaviour of light. The team took a 15-minute break before resuming with Paul's presentation.