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1. Katie Mack (astrokatie@mastodon.social)'s status on Saturday, 30-Sep-2023 12:50:06 UTC Katie Mack

   Have you heard about JWST seeing galaxies that shouldn’t exist? There’s more to that story!

   My latest for BBC Science Focus: https://www.sciencefocus.com/comment/james-webb-space-telescope-ancient-galaxies

   • Nigel Moss 🌻 (nigenet@mastodon.social)'s status on Saturday, 30-Sep-2023 13:00:37 UTC Nigel Moss 🌻

     in reply to

     @AstroKatie To be fair, the universe didn't have social media back then. Less time for procrastination, more time for galaxy-building 🙂

   • Katie Mack (astrokatie@mastodon.social)'s status on Saturday, 30-Sep-2023 13:59:21 UTC Katie Mack

     in reply to

     • François

     @jaztrophysicist Thanks! And yeah, baryons are a hot mess 😂

   • François (jaztrophysicist@astrodon.social)'s status on Saturday, 30-Sep-2023 13:59:22 UTC François

     in reply to

     @AstroKatie coon write-up. People tend to forget just how messy the baryons tend to be despite their small share of the pie 🙂

   • Katie Mack (astrokatie@mastodon.social)'s status on Saturday, 30-Sep-2023 13:59:30 UTC Katie Mack

     in reply to

     • Phil Plait
     • Rick VA3DSO 🇨🇦 🏳️‍⚧️ 🔭

     @deepskies @badastro Thank you!

   • Rick VA3DSO 🇨🇦 🏳️‍⚧️ 🔭 (deepskies@astrodon.social)'s status on Saturday, 30-Sep-2023 13:59:31 UTC Rick VA3DSO 🇨🇦 🏳️‍⚧️ 🔭

     in reply to

     • Phil Plait

     @AstroKatie Awesome article! Thank you so much for that. I love it when professionals such as yourself or @badastro post your thoughts on these issues (like this one or UAPs) coming up in the media, as I get peppered by my colleagues and family with questions. It's nice to have some well thought out scientific perspectives to give them. With being just an observational amateur, none of these things are my specialty. Thank you!

   • Nick Appleyard (nick_appleyard@mastodonapp.uk)'s status on Saturday, 30-Sep-2023 15:50:09 UTC Nick Appleyard

     in reply to

     @AstroKatie

     Noting the caveats about the observations, if this does mess up the cosmological age/distance curve then what are the implications?
     Is dark energy then trashed, for example?

   • Katie Mack (astrokatie@mastodon.social)'s status on Saturday, 30-Sep-2023 15:50:09 UTC Katie Mack

     in reply to

     • Nick Appleyard

     @nick_appleyard Nah nothing like that. At worst, it would require altering the expansion rate in the early universe somehow

   • Katie Mack (astrokatie@mastodon.social)'s status on Saturday, 30-Sep-2023 18:06:13 UTC Katie Mack

     in reply to

     • aeva

     @aeva Good question! Main way is to use patterns of known absorption or emission lines. They’ll get shifted to longer wavelengths but will appear at the same places relative to each other in the spectrum

   • aeva (aeva@mastodon.gamedev.place)'s status on Saturday, 30-Sep-2023 18:06:14 UTC aeva

     in reply to

     @AstroKatie this stuff is so neat. how do we tell if something is red shifted vs just being red to begin with?