Owen Gwynne 's Avatar

Owen Gwynne

@owengwynne.bsky.social

Lover of science especially astronomy. Lives in NW England. In training for retirement. As Einstein said "Only a fool believes everything they read on X - aye, and be sceptical of 'owt on Bluesky"

42 Followers  |  175 Following  |  199 Posts  |  Joined: 19.10.2023  |  2.1384

Latest posts by owengwynne.bsky.social on Bluesky

'painful decisions' - 'have the stomach for it'
'full freedom to do what they think is right for their residents'

that's dangerous talk

15.02.2026 18:24 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
A white humanoid (but not human) figure stands mounted on a rock drill - looking very much like a very heavy duty machine gun.

A white humanoid (but not human) figure stands mounted on a rock drill - looking very much like a very heavy duty machine gun.

My first visit to the Birmingham Museum & Art Gallery was through one of the side entrances and up some stairs to ...
The Epstein 'Rock Drill'
I stood, staggered, for ages.

13.02.2026 22:07 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
A charity shop display. On the top shelf is a ceramic plate with "Daddy I love you" on it.

A charity shop display. On the top shelf is a ceramic plate with "Daddy I love you" on it.

Try not to imagine the story behind this...

12.02.2026 13:18 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Someone check his accounts

11.02.2026 18:52 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Adding girth to get extra length, it's a slippery slope for sure.

06.02.2026 00:09 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

An excited Oxygen atom can take about 2 min before emitting the red colour. Only possible at very low density (v. high in the atmosphere).
Green light emission takes less than a second, so can happen at higher density, lower down.
Nitrogen molecules even less time, so lower
All down to density.

05.02.2026 17:28 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Good question. Whether the boundaries will rise or fall with the change in our magnetic field is an interesting question, but not one to which I can contribute an answer.

05.02.2026 12:37 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Coloured horizontal bands representing the colours generated by aurorae. Above 180miles is red from Oxygen atoms, between 180 and 60miles is green from Oxygen, and below 60 miles is blue from Nitrogen.
A yellow band around 180 miles is due to a mix of red and green, a purple/lilac band around 60 miles is a mix of green and blue

Coloured horizontal bands representing the colours generated by aurorae. Above 180miles is red from Oxygen atoms, between 180 and 60miles is green from Oxygen, and below 60 miles is blue from Nitrogen. A yellow band around 180 miles is due to a mix of red and green, a purple/lilac band around 60 miles is a mix of green and blue

πŸ”­ I've known in principle that the different colours of aurorae are due to different elements at different heights, but the facts have never really 'stuck' in my mind. So I made this chart to help me remember.

05.02.2026 09:58 β€” πŸ‘ 9    πŸ” 1    πŸ’¬ 1    πŸ“Œ 1

Not just them, but the pathetic ones who aren't worth anything to foreign powers, but just don't have the bravery to say "this is disgusting" out loud.

23.01.2026 17:42 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

What's notable is the craven silence from Reform and their fellow followers on the Right.
If any other world leader had said the same, they'd be calling for retaliation...
But from them, crickets

23.01.2026 17:13 β€” πŸ‘ 52    πŸ” 5    πŸ’¬ 1    πŸ“Œ 0

Her biography was written by Mary BrΓΌck (nΓ©e Conway), another notable Irish Astronomer.

07.01.2026 18:55 β€” πŸ‘ 8    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

And once you've observed it, destroy it - I think that's how it goes isn't it 😜

04.01.2026 13:32 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The French Revolutionary Calendar used the Autumn equinox as the date of the New Year.

04.01.2026 13:29 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The ones you don't know are often the ones you are most grateful to now know

03.01.2026 23:07 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Perihelion will fall during our summer months in about 13,000 years I think. I'm happy to be corrected by a proper astronomer.

03.01.2026 13:10 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
A plot of the time of perihelion (around 4th January) from 1992 to 2020 - showing how it doesn't follow a regular pattern.

A plot of the time of perihelion (around 4th January) from 1992 to 2020 - showing how it doesn't follow a regular pattern.

A potential problem with using perihelion to define the start of the year is that it jumps around so much - mainly because the Moon's position isn't tied to the Solar year, so sometimes the Earth is nearer (Full Moon), and sometimes further (New Moon)

03.01.2026 12:37 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
A composite image of the Sun (with sunspots) - top half taken near perihelion, the bottom half near aphelion showing the difference in apparent size (about 3% difference between them)

A composite image of the Sun (with sunspots) - top half taken near perihelion, the bottom half near aphelion showing the difference in apparent size (about 3% difference between them)

Two images, one taken near perihelion, and again near aphelion showing the difference in apparent size (about 3% difference between them). A fixed optical system (Seestar 50) means the image scale is constant.

03.01.2026 12:28 β€” πŸ‘ 62    πŸ” 8    πŸ’¬ 3    πŸ“Œ 3

To be honest, they're debts that are deemed unrecoverable; so have next-to-no commercial value to the lenders.
Hence can be bought at Β£10per Β£100.
Yes, they constitute a shackle around the necks of the debtors, but if there was a widescale 'debt buy-out' their value (& cost) would really jump!

21.12.2025 21:10 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The field of Hubble is insanely small - it's like one soccer goalkeeper showing the other goalkeeper a postcard when they are both on their goal-lines.

04.12.2025 22:27 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Apex predators stop the 'sub-apex' predators from doing too much harm to the non predatory things in the domain.
If possums are frequent enough to be significantly predatory, appreciating the role of the Powerful Owl might be the best response.

03.12.2025 23:44 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

You're on the right side Robin.
If there is anyone who personifies the sentiment that's expressed in St Francis' Prayer*, it's you.

* (obs: except the appeals to a 'Lord/Master')**

** gotta have a footnote, even in a <whatever one of these is called>

22.11.2025 00:00 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Citation from the OED entry
I write to tell you that it is a judgement on the whole lot of you. Montgomerys, The Snob Queers like Roseberry & certainly Christian hypocrite Gladstone.
Marquess of Queensberry, Letter 1 November in R. Ellmann, Oscar Wilde (1987) xvi. 402

Citation from the OED entry I write to tell you that it is a judgement on the whole lot of you. Montgomerys, The Snob Queers like Roseberry & certainly Christian hypocrite Gladstone. Marquess of Queensberry, Letter 1 November in R. Ellmann, Oscar Wilde (1987) xvi. 402

Probably wasn't widespread, but certainly it seems that it was a term that was used in reference to gays.
OED has a citation from 1894 written by the Marquess of Queensberry

21.11.2025 20:39 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Apparently, despite the common belief, although Hugo Boss made the uniforms, they didn't design them.
The design was by SS-GruppenfΓΌhrer Karl Diebitsch, an artist, and graphic designer Walter Heck

20.11.2025 20:45 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
On the left is a Half Moon taken today, just a few hours after Perilune, when the Moon is closest the Earth (~357,500 km away)
On the right is a Half Moon taken in April, just one hour after Apolune, when the Moon is furthest from the Earth (~406,300 km away)

On the left is a Half Moon taken today, just a few hours after Perilune, when the Moon is closest the Earth (~357,500 km away) On the right is a Half Moon taken in April, just one hour after Apolune, when the Moon is furthest from the Earth (~406,300 km away)

Perilune yesterday, and Apolune last April.
Cloudy yesterday, so this is 20 hours later, but only about 800km further away than the closest approach.
13.6% larger
#astronomy

06.11.2025 22:28 β€” πŸ‘ 19    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

Could be her on her holidays

27.10.2025 16:58 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Also available for 99p on Google Play Books - it's where I get most of my books

27.10.2025 11:30 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

It can be a problem if it spreads into pasture grasslands though.

19.10.2025 08:56 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Boringly, it is possible that some big brand tampons will have involved animal testing - which would make them ineligible for having a vegan status.
Other brands will not have been tested on animals.

11.10.2025 20:04 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

OAPs aren't the same as OAPs were when we were younger.

07.10.2025 13:57 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I'm with 1066 on this.

02.10.2025 22:57 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

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