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Wah gwan family? join us in this video as we share certain things that shocked us about living in Ghana. We also discussed solutions on how to face these shocks as Africans of the diaspora returning to The continent. Please join us in the discussion and let's figure out these issues together.
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Many hand dug wells dry up at the end of the dry season, because more water is taken out than is coming in by the natural recharge. Reasons of limited groundwater recharge are heavy rainfall in short time, (climate change) compact topsoil layers, erosion because of loss of vegetation, etc. Options to increase the recharge of ground water are above or underground dams, the planting of trees and plants such as vetivar grass, making contour canals etc. An other option is the so called “Tube recharge”. This low-cost option combines a manually drilled hole with a drainage tube, a filter and a small pond. Rainwater, that otherwise would run off to rivers or evaporate, thus penetrates into the ground and reaches the first aquifer.
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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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📚 "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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👩🏽💻 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




