Intergalactic Stars, Sun Switching Poles, A Second Sun | Q&A 264

Can stars be born without a parent galaxy? Can quasars destroy life in an entire galaxy? Is there another planet in our Solar System after all? Did the Sun have a sibling star at some point? Answering all these questions and more in this week's Q&A show.

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00:00 Start
00:51 Are there stars without a parent galaxy?
04:43 Can quasars sterilise their galaxies?
08:57 Did we find Dyson spheres?
13:04 Will I consider using LLMs in my work?
16:32 Is there a ninth planet?
19:19 If no Planet X is found, are black holes the only explanation?
21:25 If nothing spun, would there still be gravity?
23:41 Can telescopes at L2 see on the other side of the Sun?
27:07 Do we have a second star?
29:49 Is going to the Moon before Mars the right idea?
33:21 How do we know single pixel images aren't just noise?
36:44 Can the Sun switch its axis?

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[busybillyb]

6:20 I didn't expect your death beam to knock me off my chair 🤣

[PhilixDMA]

A cat living long term on a moon base is the cutest thing I've ever heard. This needs to be a NASA priority. It would be the greatest PR move in the history of space exploration.

[laurachapple]

"Oh, that would That was *heartfelt*.

[MercuryIsHg]

Hi Fraser, thank you so much for your show. Enjoy your hard earned break.

[karlputz]

Best Black Hole Death Ray Animation ever.

[dougieh]

Love your content. Been watching 10 years now 😊

[mattwuk]

As an amateur nerd, thank you, I love this channel.

[animistchannel]

Thank you for another fabulous season of all your content! I hope your semi-hiatus time lets you enjoy the bright season.

[removechan]

favorite show on youtube!! what will we go outside? get hit by solar flares????
THANK YOU!! have a great summer, make the most of it!

[qmain]

Have a great summer break! Thank you for the content

[corymoore]

I’ve captured the most detailed image of Uranus ever seen, it’s magnificent.

[tiagotiagot]

33:27 More than just which elements are present, you can also get temperature measurements (if you can calibrate the measurement to account for the redshift caused by the expansion of the Universe); and rotation estimates (by how smeared the lines are due the rotation causing parts of the object to be moving away and other parts moving towards us, causing asymmetrical red/blueshift) and all sorts of other estimates based on statistical models of how different characteristics would cause different smears and spike intensities at different shifts etc. You won't get a perfect 2d image, but no only more than a single pixel, it's even more than just a single line; there would some level of educate guessing involved though, and results could be a bit ambiguous, compatible with multiple interpretations.

I'm not 100% sure on all the details, this is just an assemblage of things I've heard over the years, and my memory is a bit flakey; I'm not anywhere near being a professional of the area. I'm sure there are people that could explain things much better and with less mistakes.

[tonywells]

A signal from a single pixel could be noise, but telescopes capture long exposures so that pixel receives multiple photons and the more photons it receives the more the signal to noise ratio increases.

[davesatxify]

Thanks to you and your team for taking the time to relesase this

[bruiserdog]

Omg, it doesn't seem long since the summer break last year. Year has flown by

[ashleyobrien]

imagine our solar system being alone out in intergalactic space....in the middle of the technology and the courage required to "make the leap"...

[joecaves]

We have a binary companion, it's Pluto, it's not a planet with 4 moons, it is a broken up ash dwarf. They are all solid carbon, not simply dusted by carbon. Also gravity is acceleration not spin, here gravity is an acceleration of 9.2m per sec^2.

[cykkm]

Fraser, I envy your holidays! I haven't had any since 2021, am overworked, have postponed home and computer maintenance and hobbies. I've composed no complete piece of music in 4 years, haven't configured auto backups on the new workstations I bought in 2022, and… oh I'd better stop! I wish you have all the joy that I've missed in 3 years—here, please, I'm happy to give you all my unused fun, I dusted it and polished it to mirror shine!!! Love your channel so much! 😍

[NeuroD]

When you look at something, always try to see the unseen - it’s much more important.

[Beldizar]

RJ's question might have been related to the idea that gravity isn't a "force" but a curvature of spacetime. If we describe gravity as a curvature of spacetime, everything is in motion all the time and follows the curved spacetime lines "down" as if pulled by a force of gravity. But if nothing is moving, it doesn't take a curved path anymore, since it isn't moving at all. At that point, we would expect it wouldn't fall, since it wouldn't be following any curved spacetime lines "down" anymore.