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The new BLACK HOLE image explained by an ASTROPHYSICIST | Your questions answered

The new BLACK HOLE image explained by an ASTROPHYSICIST | Your questions answered Kwabena Ofori Osei 38 Views • 4 years ago

The Event Horizon Telescope collaboration just released the first ever image of the Milky Way’s supermassive black hole (the same group that took the first ever image of a black hole in 2019 - the one in the centre of the Messier 87 galaxy). What do we learn from this image? Why is it orange? Why is it different to the M87 image? Why is it blurry? And can we observe the same thing with the James Webb Space Telescope?

Why yes this was filmed and edited in a single day. Thanks for noticing. Yes I am exhausted.

Read more about the newly released image here from @ESOobservatory: https://www.eso.org/public/news/eso2208-eht-mw/

Event Horizon Telescope collaboration (2022; Paper I) - https://iopscience.iop.org/art....icle/10.3847/2041-82
The plan to observe the galactic centre with JWST - https://www.stsci.edu/jwst/phase2-public/1939.pdf
TED talk on how computer algorithm to fill in the gaps works from Katie Bouman - https://www.youtube.com/watch?v=BIvezCVcsYs

00:00 - Introduction
01:04 - How do we take images like this?
03:37 - How does this compare to the M87* image?
05:51 - Why is the image blurred?
08:30 - Why is it orange?
09:53 - What are the 3 bright blobs?
11:29 - What angle are we seeing this from?
17:07 - Will we observe this with JWST?
19:10 - Outro
19:36 - Bloopers

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👕 Check out my merch here: https://teespring.com/stores/dr-becky

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📚 "Space: 10 Things You Should Know" - UK Edition: http://bit.ly/SpaceDrBecky

📚 US & Canada version: "Space at the speed of light" (same book, different title, with some beautiful illustrations): https://www.penguinrandomhouse.....com/books/635406/sp

📚 German translation "Das kleine Buch vom großen Knall" : https://www.dtv.de/buch/becky-....smethurst-das-kleine

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🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive

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🔔 Don't forget to subscribe and click the little bell icon to be notified when I post a new video!

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👩🏽‍💻 I'm Dr Becky Smethurst, an astrophysicist at University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on *how* we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars.

http://drbecky.uk.com
https://rebeccasmethurst.co.uk

The COLONIAL ROOTS of the genocide in Rwanda | Documentary

The COLONIAL ROOTS of the genocide in Rwanda | Documentary Kwabena Ofori Osei 65 Views • 2 years ago

In April 1994, the parents of two-year-old Samuel Ishimwe were murdered in Rwanda. Their fate was shared by up to a million people in the genocide against the country’s Tutsi minority. Thirty years on, Samuel sets out to discover what set these terrible events in motion.

He undertakes a journey from Rwanda to Germany and Belgium, both former colonial powers in the small East African nation. He hopes it will help him to understand the basis for the Hutu majority’s animosity towards the country’s small Tutsi minority. In Rwanda and Europe, Samuel meets with historians and contemporary witnesses. He wants to understand what happened to make people in his homeland turn on each other in such a way. What role was played by the "Hamite hypothesis,” a theory that assigned the Tutsis racial superiority? What’s the story behind all the human skulls taken to Germany from Rwanda more than 100 years ago? And, he asks, are the former colonial powers to blame for the fact that his parents, like so many other Rwandans, had to die? Or do the Rwandans bear the responsibility for the terrible mass murders that occurred between April and July 1994?

Whereas Hutus and Tutsis in Rwanda saw themselves as belonging to different social classes, the German colonial rulers who were here from the late 19th century until 1916 defined them along ethnic, racial lines. In the 19th century, many Tutsis were members of an upper class with assets that included valuable cattle. The Hutus, on the other hand, were usually farmers with little or no livestock. For centuries, the kings of Rwanda were Tutsis. The Belgians drove the Germans out of Rwanda in World War One and assumed control of the country until its independence in 1962. These colonial rulers exacerbated the divisions between Hutus and Tutsis, exploiting discord to further their own interests. In the second half of the 1950s, the Belgians withdrew their support for the king and the ruling Tutsi government, facilitating a Hutu power grab. Large numbers of Tutsis came under attack at the time. Hundreds of thousands fled the country.

30 years after the genocide, peace now prevails in Rwanda. President Kagame’s policies have worked to break down adherence to Hutu and Tutsi identities. Does this mean that the country’s dark past and the distrust that long simmered between the groups has now been overcome?

#documentary #dwdocumentary
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