Near-field Cosmologist and Assistant Professor of Astronomy and Astrophysics at University of Chicago. he/himhttps://bsky.app/profile/alexji.bsky.socialhttps://bsky.app/profile/alexji.bsky.social/post/3mwb734emcs2dI once made a joke about Pluto in an outreach talk to a younger audience and the blank stares I received were absolutely crushing. [contains quote post or other embedded content]24 Sep 2026 11:54 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mwb734emcs2dhttps://bsky.app/profile/alexji.bsky.social/post/3mw6qux7gzk2mAstronomy can wait, I must know the conclusion to this journey [contains quote post or other embedded content]23 Sep 2026 12:34 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mw6qux7gzk2mhttps://bsky.app/profile/alexji.bsky.social/post/3mvohn54vc22kOK people need to stop finding objects “more metal poor than a few percent solar” and calling them Population III star candidates. This is getting absurd.17 Sep 2026 01:06 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mvohn54vc22khttps://bsky.app/profile/alexji.bsky.social/post/3muzgccbn322zhttps://astrobites.org/2026/09/08/rubin-first-ultrafaint-dwarf/ We (ie @wcerny.bsky.social ) found a (candidate) dwarf galaxy!08 Sep 2026 16:17 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3muzgccbn322zhttps://bsky.app/profile/alexji.bsky.social/post/3mup5idixes2bLast day of #KICPDM is the best day, dwarf galaxies! :D This thread is Ting Li, Jiaxuan Li, Andrew Pace, Kaia Atzberger, and Alyson Brooks. I am chairing so let’s see how I do with the skeeting..04 Sep 2026 14:12 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mup5idixes2bhttps://bsky.app/profile/alexji.bsky.social/post/3mup2hsnzqk2vI feel like your life is headed in a bad direction when you start thinking “maybe I should do some work on the Galactic bar” 😵‍💫04 Sep 2026 13:18 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mup2hsnzqk2vhttps://bsky.app/profile/alexji.bsky.social/post/3munbrvrjxs2nWheeeeee https://aas.org/posts/news/2026/08/nsf-astronomical-sciences-grants-reduced-over-50-fiscal-year-202603 Sep 2026 20:24 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3munbrvrjxs2nhttps://bsky.app/profile/alexji.bsky.social/post/3mumuucytps2xJulian Munoz: the UV luminosity function of high-z galaxies also constrains power spectrum (lots of degeneracies as M_UV closer to SFR the Mstar, can partially break with clustering). With JWST/GLIMPSE can reach k~30 #KICPDM03 Sep 2026 16:33 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mumuucytps2xhttps://bsky.app/profile/alexji.bsky.social/post/3mumncf5sck2eMariangela Lisanti reviews three examples of dark sector interactions. CDM is quite unusual, no standard model equivalent. p-n scattering >> self-interacting dark matter, hydrogen atom >> disspiative/atomic dark matter, EM plasma >> dark plasma #KICPDM03 Sep 2026 14:17 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mumncf5sck2ehttps://bsky.app/profile/alexji.bsky.social/post/3mukodnp2w22aVera Gluscevic starts with "read this paper for everything I won't get to" arxiv.org/abs/2607.28564 #KICPDM https://arxiv.org/abs/2607.2856402 Sep 2026 19:31 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mukodnp2w22ahttps://bsky.app/profile/alexji.bsky.social/post/3mukng2gqrk2aStephanie O'Niel is adding velocity-dependent and anisotropic SIDM to FIRE simulations #KICPDM02 Sep 2026 19:14 +0000at://did:plc:65hgl6ql7asnjs6lrquyloi2/app.bsky.feed.post/3mukng2gqrk2a