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Katie Mack
(a.k.a. Dr Katherine J Mack) astrophysicist/cosmologist, occasional freelance science writer, connoisseur of cosmic catastrophes
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Katie Mack 44 min
Odgovor korisniku/ci @tweetsoutloud
YOUR BRAIN LIES TO YOU ABOUT EVERYTHING I’M SORRY THAT IS HOW BRAINS WORK
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Katie Mack 2 h
Odgovor korisniku/ci @mega2e
That was an astonishing moment. I would not have been able to stay as calm and professional as you did when she said that.
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Katie Mack 3 h
Never believe your brain about anything
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Katie Mack 3 h
Odgovor korisniku/ci @Claire_Lee
Awww
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Katie Mack 5 h
Odgovor korisniku/ci @asborlaff
Yep
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Katie Mack 5 h
Odgovor korisniku/ci @CosmicKid1598
Stellar age estimation is hard so there’s a lot of uncertainty associated with each estimate
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Katie Mack 15 h
Odgovor korisniku/ci @KylePlantEmoji
Nature is such a jerk
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Katie Mack 18 h
“How do you find the time?” “Relentless, mostly”
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Katie Mack 19 h
You don’t have any net force on you at the center of a gravitating object, but you’re still in a deep gravitational potential well (you’d have to put a lot of effort into climbing out of it), and you have time dilation due to that.
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Katie Mack 19 h
Odgovor korisniku/ci @akivaw
No, there’s no way to experience more time, only less. Both moving quickly and being close to a gravitating object slow your clock down.
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Katie Mack 19 h
Odgovor korisniku/ci @flowinthezone
Best to think of spacetime rather than a timeline. You’re in a different position in spacetime, on a different trajectory through it.
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Katie Mack 20 h
Odgovor korisniku/ci @flowinthezone @rUv @AstronomyMag
Well you don’t exit a black hole. But if you’re close to one, when you leave, more time will have passed outside than you experienced. It’ll be like you skipped forward a bit, and your clock is now set too early.
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Katie Mack 20 h
Odgovor korisniku/ci @BCNThomson
What would convince you?
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Katie Mack 20 h
In case you were wondering
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Katie Mack 20 h
Odgovor korisniku/ci @classpectanon @rUv @AstronomyMag
More accurate to say “the universe is 13.8 billion years old, but you personally might not have experienced all of that time.” For example: Earth is 4.5 billion years old but its core hasn’t experienced quite that much time
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Katie Mack 21 h
Odgovor korisniku/ci @ann_leckie
🙌🏼
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Katie Mack 21 h
Odgovor korisniku/ci @coolbrz731
I don’t know if you noticed but there’s an article linked in the tweet
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Katie Mack 21 h
Odgovor korisniku/ci @rUv @AstronomyMag
Your own experience of the passage of time would be different near a black hole; it is also different on Earth than it would be in empty space. But the cosmos on the whole is mostly affected very little by this and so 13.8 billion years is a decent estimate almost everywhere.
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Katie Mack 21 h
Odgovor korisniku/ci @marylizbender @SpaceX
They put a low-reflectivity coating on one satellite out of sixty on the launch before the last one and no coatings on any of them in the most recent launch. Talks are nice and all but they’re still just charging ahead.
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Katie Mack proslijedio/la je tweet
YorkU - Science 22 h
Come out to on February 27 for a free public lecture about the fate of our cosmos, presented by . Register at
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