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@
AstroKatie
Waterloo, Ontario
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(a.k.a. Dr Katherine J Mack) astrophysicist/cosmologist, occasional freelance science writer, connoisseur of cosmic catastrophes
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104.189
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3.025
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341.792
Osobe koje vas prate
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Katie Mack
@AstroKatie
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44 min |
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YOUR BRAIN LIES TO YOU ABOUT EVERYTHING I’M SORRY THAT IS HOW BRAINS WORK
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Katie Mack
@AstroKatie
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2 h |
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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
@AstroKatie
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3 h |
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Never believe your brain about anything twitter.com/akiyoshikitaok…
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Katie Mack
@AstroKatie
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3 h |
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Awww
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Katie Mack
@AstroKatie
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5 h |
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Yep
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Katie Mack
@AstroKatie
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5 h |
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Stellar age estimation is hard so there’s a lot of uncertainty associated with each estimate
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Katie Mack
@AstroKatie
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15 h |
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Nature is such a jerk
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Katie Mack
@AstroKatie
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18 h |
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“How do you find the time?”
“Relentless, mostly”
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Katie Mack
@AstroKatie
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19 h |
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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
@AstroKatie
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19 h |
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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
@AstroKatie
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19 h |
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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
@AstroKatie
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20 h |
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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
@AstroKatie
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20 h |
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What would convince you?
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Katie Mack
@AstroKatie
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20 h |
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In case you were wondering twitter.com/astrokatie/sta…
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Katie Mack
@AstroKatie
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20 h |
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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 sciencealert.com/earth-s-core-i…
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Katie Mack
@AstroKatie
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21 h |
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🙌🏼
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Katie Mack
@AstroKatie
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21 h |
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I don’t know if you noticed but there’s an article linked in the tweet
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Katie Mack
@AstroKatie
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21 h |
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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
@AstroKatie
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21 h |
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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 | ||
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YorkU - Science
@YorkUScience
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22 h |
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Come out to #YorkU on February 27 for a free public lecture about the fate of our cosmos, presented by @astrokatie. Register at katie-mack.eventbrite.com
@YorkUPhysics @FWiP_YorkU @yorkobservatory @astroguypaul @AstroHyde pic.twitter.com/PNQ6FCBRHo
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