South Pole Telescope

First plane of the 2025-2026 Austral summer season landed at #southpole today! Pic by SPT winterover Sim Bash. This flight is an KBA flight Bassler plane, which is just transiting through @NSF Amundsen-Scott South Pole, on its way to an Italian base. #Antarctica @UChicago

Picture of the #sunrise behind SPT and @BICEP_Keck in the Dark Sector from a few weeks ago by SPT winterover Sim Bash #southpole #Antarctica @NSF @doescience

The South Pole Observatory (SPO) collaboration meeting is underway today and tomorrow at UChicago! SPO is a collaboration between the South Pole Telescope and BICEP collaboration!

Our winterovers are trying to find new ways to enjoy the still rising #sunrise. Here is a picture of them from last week trying to find some space for a lawn chair by the #southpole to catch some rays! @NSF

After being a little cloudy for the first few days after #sunrise, the winterovers are finally starting to see a little bit of #Sun at the #southpole! Pic by winterover Sim Bash! @NSF

This weekend was official #sunrise at the #southpole! Which happens at the autumn equinox. Unfortunately, the weather was very overcast, as you can see from this picture (credit: winterover Sim) during the official sunrise day! #whiteout @NSF @NOAA #Antarctica

SPT-3G 1500d D1 MCMC Chains are now available on
@NASA_LAMBDA
lambda.gsfc.nasa.gov/product/spt/...

NOAA scientist Ian Crocker on top of the atmospheric monitoring tower at the #southpole (Pic by Kevin Leung).
@noaa.gov
(formerly the US Weather Bureau) have been monitoring weather there since January 1957! #Antarctica

Picture from winterover Sheryl Seagraves. The view from station out to the Dark Sector. Getting much brighter outside about 2-weeks before #sunrise. The red "night" lights from the telescope are becoming less visible against the brightening sky. #Antarctica @NSF

Getting closer to #sunrise at the #southpole, with official sunrise still nearly three weeks away. Winterover Sim capturing a picture of the horizon behind the ceremonial South Pole with his rubber duck on top. #Antarctica

SPT winterover Sim Bash attempting to play #chess outside at the #southpole during the annual Pole #Olympics, in -30 deg F temps and 30 knot winds. Sim unfortunately reigned after too many pieces blew away. Pic by Zach.

U.S. Researchers May Never Probe Deep into Antarctica’s ‘Doomsday Glacier’ Again Without This Ship The National Science Foundation will stop operating the Nathaniel B. Palmer icebreaker and slash polar science funding by 70 percent, devastating Antarctic research

Nice article describing the devastating impact of the President's Budget on the US Antarctic science program: www.scientificamerican.com/article/u-s-...

A group of winterovers, including SPT's Karia Dibert, posing in front of the #southpole marker (pic by Kevin Leung). The long exposure helps to see signs of the #sunrise at Pole, but with the stars overhead there will still be some decent night sky viewing. @NSF

It's still about a month away from official #sunrise at the #southpole, but they are starting to see signs of the Sun on the horizon! Picture by winterover Zeke Mills from the deck on the station! @NSF #southpole

Another picture from winterover Zach Tejral of SPT observing a couple weeks ago, with some nice #aurora and the #milkyway just overhead. #Antarctica #southpole @NSF

Picture from Winter Site Manager Zach Tejral of the Dark Sector Lab (DSL), which hosts the BICEP-3 experiment, and the South Pole Telescope! #ANTARCTICA @NSF @doescience #nsfunded #doefunded

New SPT-3G constraints on early dark energy: "combining with DESI ... we get fEDE=0.071+0.035−0.038 at 68% CL and a weak preference for AEDE over ΛCDM. this shift is a manifestation of the discrepancy present between DESI and CMB experiments in ΛCDM" arxiv.org/abs/2507.23355

Quick picture by SPT winterover Sim Bash on their way out to the telescope, with the red glow from the station lights in the background, and some nice #aurora overhead! #Antarctica @NSF

The SPT winterovers recently hosted an open house and tour of the telescope. Since SPT is 1-km from station, many winterovers don't make it out often, so it's nice to have open houses to help learn about the science they are supporting! Pic by Kevin Leung @NSF @doescience

It's a couple weeks late, but South Pole recently celebrated mid-winter at the #southpole. Mid-winter is a big milestone for the winterovers, who are spending a year at the South Pole. Attached is the official mid-winter photo, and dinner announcement from this season!

SPT/SPT-3G collaboration meeting taking place this week at
@UChicago! Great to see everyone and having great discussions about all the ongoing science analyses of SPT data! @NSF @doescience #Antarctica

Photo by Kevin Leung. SPT winterovers watching #aurora at the "End of the World", the unofficial end of the extent of the South Pole station infrastructure footprint. #southpole @NSF

Tonight at 530pm in Harold Washington Library #Chicago, SPT scientist and former winter over Dr Matt Young is giving a free public lecture, learn about the science of SPT and what its like to live/work at the South Pole #Antarctica!
@UChicago t.co/uHlpPlchRA

YouTube video by South Pole Telescope SPT-3G D1: CMB power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field

SPT-3G D1 Webinar: CMB TT/TE/EE power spectra and cosmology from 2019-2020 observations from SPT-3G Main Field - Now Live!!! youtu.be/TRJ5sfAwnao
@NSF @doescience @UChicago
#NSFfunded #DOEfunded #Antarctica

There will also be public Q&A session on Thursday, June 26 at 1pm CDT (2pm EDT, 11am PDT, 6pm UTC) hosted by the Cosmology from Home team. See this website (cosmologyfromhome.com/spt-2025) for details. #NSFunded #DOEfunded #Antarctica

South Pole Telescope

On Wed, June 25, the SPT collaboration will release major new results from SPT-3G, via a pre-recorded webinar at 9.30am CDT on youtube youtube.com/@southpolete..., with the paper released at Noon CDT, on the SPT-3G website pole.uchicago.edu
@NSF @doescience #Antarctica

SPT winterover Karia Dibert pictured under a nearly full moon (or moondog) at the #southpole (Pic by Toshin Rao). On a 2-mile thick ice sheet in many directions the horizon is featureless, and the moon beautifully highlights the sastrugi. @NSF @doescience #Antarctica

New SPT-3G data release of the Euclid Deep Field-S taken in Nov-2024, with maps and source catalogs. In 57 deg^2, achieved depth of 4/4/13 uK-arcmin at 95/150/220 GHz, about 10x deeper than Planck, finding 114 dusty DSFGs and 217 galaxy clusters. @NSF arxiv.org/abs/2506.00298

With all the #aurora going on in the northern hemisphere right now, our winterovers Karia and Sim also thought it would be a good time to pull up a couch and watch them near the #southpole! Pic by Kevin Leung. @NSF @NOAA

This week, the south pole winterovers had a zoom call with Apollo 13 @NASA astronaut Fred Haise! People were thrilled to talk to him, hear his stories, and impressed by this 91-year old! @NSF #MemorialDay2025