Uploaded July 2024 | Updated September 2026, 2 weeks ago
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In this month’s Night Sky News episode we’re chatting about how to spot the conjunction of Mars & Jupiter, the Moon occult Saturn, and the Pleiades meteor shower. Plus in space news we’ll be chatting about the intermediate mass black hole that’s been found in our galaxy, right in the mass gap where we’ve never found a black hole of that mass before, ESA’s recent Ariane 6 launch, JWST’s look at the famous Penguin galaxy, plus the asteroid Chiron turning into a comet.
The Galaxy Zoo: Euclid project needs your help classifying the shapes of galaxies - galaxyzoo.org
Timings for occultation of Saturn by the Moon - lunar-occultations.com/iota/planets/0821saturn.htm
Last week’s video on all the record holders of the title “most distant galaxy” - youtube.com/watch?v=nkYeHYDneHU
My previous video on the Euclid Space Telescope - youtube.com/watch?v=JFAB1MhYGyc
My previous Night Sky News video with an intermediate mass black hole discovery - youtube.com/watch?v=rDWLakJW5i8
Dobson et al. (2024; Chiron brightening) - arxiv.org/pdf/2407.14410
Pinilla-Alonso et al. (2024; JWST observes Chiron) - arxiv.org/pdf/2407.07761
Häberle et al. (2024; intermediate black hole mass candidate in omega centauri) - arxiv.org/pdf/2405.06015
Walmsley et al. (2023; ZooBot AI algorithm) - joss.theoj.org/papers/10.21105/joss.05312
00:00 Intro
01:02 Jupiter + Mars + Moon end of July
02:08 Jupiter + Mars Conjunction mid-August
03:21 How to watch the Perseids Meteor Shower
05:51 Saturn x Moon Occultation
07:21 Ariane 6 inaugural launch
09:10 JUICE Earth fly-by
11:31 Chiron turns into a comet?
14:16 JWST observes the Penguin Galaxy
16:22 New candidate intermediate mass black hole found
24:03 Bloopers
Video filmed on a Sony ⍺7 IV
Video edited by Jonny Hyman
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📚 My new book, "A Brief History of Black Holes", out NOW in hardback, paperback, e-book and audiobook (which I narrated myself!): lnk.to/DrBecky
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👕 My new merch, including JWST designs, are available here (with worldwide shipping!): dr-becky.teemill.com
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🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive
---
🔔 Don't forget to subscribe and click the little bell icon to be notified when I post a new video!
---
👩🏽💻 I'm Dr. Becky Smethurst, an astrophysicist at the 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.
drbecky.uk.com
rebeccasmethurst.co.uk
AD - FlexiSpot July Sale - Up to 50% off Sale - bit.ly/3VPefti
AD - FlexiSpot Standing Desk E7 PRO - bit.ly/3XVYXFX
In this month’s Night Sky News episode we’re chatting about how to spot the conjunction of Mars & Jupiter, the Moon occult Saturn, and the Pleiades meteor shower. Plus in space news we’ll be chatting about the intermediate mass black hole that’s been found in our galaxy, right in the mass gap where we’ve never found a black hole of that mass before, ESA’s recent Ariane 6 launch, JWST’s look at the famous Penguin galaxy, plus the asteroid Chiron turning into a comet.
The Galaxy Zoo: Euclid project needs your help classifying the shapes of galaxies - galaxyzoo.org
Timings for occultation of Saturn by the Moon - lunar-occultations.com/iota/planets/0821saturn.htm
Last week’s video on all the record holders of the title “most distant galaxy” - youtube.com/watch?v=nkYeHYDneHU
My previous video on the Euclid Space Telescope - youtube.com/watch?v=JFAB1MhYGyc
My previous Night Sky News video with an intermediate mass black hole discovery - youtube.com/watch?v=rDWLakJW5i8
Dobson et al. (2024; Chiron brightening) - arxiv.org/pdf/2407.14410
Pinilla-Alonso et al. (2024; JWST observes Chiron) - arxiv.org/pdf/2407.07761
Häberle et al. (2024; intermediate black hole mass candidate in omega centauri) - arxiv.org/pdf/2405.06015
Walmsley et al. (2023; ZooBot AI algorithm) - joss.theoj.org/papers/10.21105/joss.05312
00:00 Intro
01:02 Jupiter + Mars + Moon end of July
02:08 Jupiter + Mars Conjunction mid-August
03:21 How to watch the Perseids Meteor Shower
05:51 Saturn x Moon Occultation
07:21 Ariane 6 inaugural launch
09:10 JUICE Earth fly-by
11:31 Chiron turns into a comet?
14:16 JWST observes the Penguin Galaxy
16:22 New candidate intermediate mass black hole found
24:03 Bloopers
Video filmed on a Sony ⍺7 IV
Video edited by Jonny Hyman
---
📚 My new book, "A Brief History of Black Holes", out NOW in hardback, paperback, e-book and audiobook (which I narrated myself!): lnk.to/DrBecky
---
👕 My new merch, including JWST designs, are available here (with worldwide shipping!): dr-becky.teemill.com
---
🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive
---
🔔 Don't forget to subscribe and click the little bell icon to be notified when I post a new video!
---
👩🏽💻 I'm Dr. Becky Smethurst, an astrophysicist at the 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.
drbecky.uk.com
rebeccasmethurst.co.uk




![How do we know there are 2 TRILLION galaxies in the Universe?
AD - To try everything Brilliant has to offer for free for 30 days visit https://brilliant.org/DrBecky and youll also get 20% off an annual premium subscription which gives you unlimited daily access to Brilliant. | How many galaxies are there out there in the Universe? Well our best estimate in 2026 is that there’s *at least* 2 trillion galaxies, islands of billions of stars just like our own Milky Way galaxy. But how do we actually know that? That’s far too big of a number for anyone to have gone out and literally done a count one by one [insert home alone count scene], so what do we do instead? Well in this video we’re going to dive in to how us astrophysicists get at this number, and we’re going to try and put that number into content, how big is 2 trillion really?
Conselice et al. (2016) - https://assets.science.nasa.gov/content/dam/science/missions/hubble/releases/2016/10/STScI-01EVSR313NHNAC17DF62MP9QV9.pdf
00:00 2 TRILLION galaxies
01:10 Complication 1: the observable Universe
02:40 Complication 2: which direction you look in?
04:31 Complication 3: which telescope you use
06:35 Complication 4: what counts as a galaxy?
08:31 How big is 2 trillion really?
Video filmed on a Sony ⍺7 IV
Video edited by Martino Gasparrini: https://www.fiverr.com/mgs_editing
📚 My book, A Brief History of Black Holes, out NOW in hardback, paperback, e-book and audiobook (which I narrated myself!): http://lnk.to/DrBecky
👕 My merch, including JWST designs, are available here (with worldwide shipping!): https://dr-becky.teemill.com/
🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive
🔔 Dont forget to subscribe and click the little bell icon to be notified when I post a new video!
👩🏽💻 Im Dr. Becky Smethurst, an astrophysicist at the 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 dont know. If youve ever wondered about something in space and couldnt 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 How do we know there are 2 TRILLION galaxies in the Universe?](https://i.ytimg.com/vi/ttsxKzWle00/mqdefault.jpg)





