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Barbara Ryden

@bsryden

Writer of astrophysics textbooks, servant to cats

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12.11.2024
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Latest posts by Barbara Ryden @bsryden

Petting alpacas *and* super-Eddington flows? Best conference ever! (Is it too late to sign up?)

10.03.2026 20:35 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Awww... You're so adorable when you pretend to be old. I just want to to pat you on the head and give you some cookies and milk.

09.03.2026 23:52 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

You guys should read this article.

08.03.2026 16:10 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

It was not an Ignobel event. (Let's just say that the social events at astrophysics conferences can become slightly random.)

06.03.2026 20:00 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0

I have heard a physics Nobel laureate sing "Because I could not stop for Death" to the tune of The Yellow Rose of Texas.

06.03.2026 01:14 ๐Ÿ‘ 4 ๐Ÿ” 1 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0

Is the bear cross-eyed? Is it named "Gladly"?

04.03.2026 23:24 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

I've got a cosmology textbook from 2017 that struggles with the nature of dark energy. Oh wait, I wrote that one.

25.02.2026 16:12 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

I am glad that you didn't continue driving once you ran out of road.

24.02.2026 18:31 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Orange tabby cat. Underneath the cat is a lap.

Orange tabby cat. Underneath the cat is a lap.

Same, Misty. Same.

20.02.2026 23:37 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Finally... some "introverted astronomer" representation in the media!

08.02.2026 13:37 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Not me. But you've done such a great job with Flaubert, I think you should continue with Bierce!

31.01.2026 00:45 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Are you going to switch to Ambrose?

31.01.2026 00:41 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
A gray and white cat and an orange tabby cat are snuggled together atop a fleece blanket.

A gray and white cat and an orange tabby cat are snuggled together atop a fleece blanket.

Happy #Caturday. If you are in the path of a winter storm, Trim and Finn recommend that you keep warm.

24.01.2026 15:35 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

I โค๏ธ Love

16.01.2026 01:51 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Thank you! The book's success is due to Marc's amazing knowledge of stellar interiors... plus a few strategically placed footnote jokes.

14.01.2026 20:41 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Stellar Structure and Evolution: a very fine textbook.

14.01.2026 13:35 ๐Ÿ‘ 15 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

My blind cat is tidy, my sighted cat is messy.

12.01.2026 21:00 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Barbara Ryden (wearing a nametag saying "Barbara Ryden") stands in front of a large sign saying "AAS".

Barbara Ryden (wearing a nametag saying "Barbara Ryden") stands in front of a large sign saying "AAS".

It is not strictly required, when attending a meeting of the American Astronomical Society, to pose in front of the big AAS sign. However, I couldn't resist the opportunity. #aas247

08.01.2026 22:19 ๐Ÿ‘ 13 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Sounds fishy to me; but then, one man's meat is another man's poisson.

02.01.2026 23:24 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Epigraph for chapter 8 of Astrophysical Gas Dynamics:

When Newton saw an apple fall, he found
In that slight startle from his contemplation -
'Tis said (for I'll not answer above ground
For any sage's creed or calculation) -
A mode of proving that the earth turn'd round
In a most natural whirl, called "gravitation";
And this is the sole mortal who could grapple,
Since Adam, with a fall or with an apple.

Lord Byron, "Don Juan," Canto X [1823]

Epigraph for chapter 8 of Astrophysical Gas Dynamics: When Newton saw an apple fall, he found In that slight startle from his contemplation - 'Tis said (for I'll not answer above ground For any sage's creed or calculation) - A mode of proving that the earth turn'd round In a most natural whirl, called "gravitation"; And this is the sole mortal who could grapple, Since Adam, with a fall or with an apple. Lord Byron, "Don Juan," Canto X [1823]

I haven't quite decided if this is the ideal epigraph for chapter 8. Too Byronic, do you think, or just Byronic enough?

01.01.2026 22:17 ๐Ÿ‘ 5 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Snug

27.12.2025 13:27 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
An orange tabby cats sits inside a cardboard box.

An orange tabby cats sits inside a cardboard box.

Happy Boxing Day from Finn the cat!

26.12.2025 17:29 ๐Ÿ‘ 7 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

I once read that Reber's mom (nรฉe Harriet Grote, hence Reber's unusual first name) would hang laundry to dry on the supports of the radio telescope. Did your father ever report having to dodge damp sheets?

22.12.2025 17:43 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Orange tabby cat, sitting comfortably on a human lap

Orange tabby cat, sitting comfortably on a human lap

Happy #Solstice! I hope everyone in the northern hemisphere is keeping warm (preferably with the help of a cat).

21.12.2025 15:03 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
A gray and white cat (Trim) licks the head of an orange tabby cat (Finn).

A gray and white cat (Trim) licks the head of an orange tabby cat (Finn).

I hope you are having a well-groomed #Caturday (perhaps with a little help from a friend).

13.12.2025 15:40 ๐Ÿ‘ 15 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Beast wishes,
Barbara

08.12.2025 23:06 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Oh, I know Archie Leach! He went to school in Bristol with my buddy Paul Dirac.

29.11.2025 00:38 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

"A little watermelon clears us of this deed."

27.11.2025 00:00 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

"Some are born grape, some achieve grapeness, while others have grapeness thrust upon them!" [Takes a bow, exits]

26.11.2025 23:20 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
An orange tabby cat examines the book Physics for Cats, by Tom Gauld.

An orange tabby cat examines the book Physics for Cats, by Tom Gauld.

Happy #Caturday! At this point, my cats' knowledge of physics is starting to catch up with mine.

22.11.2025 23:04 ๐Ÿ‘ 8 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0