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Dark Energy Survey @TheDESurvey
May 13
RT @NOIRLabAstro:NOIRLab will celebrate 10 years of DECam operations, with an in-person community workshop in Tucson 12–14 September… https://t.co/J7mKKs5QIg

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Dark Energy Survey @TheDESurvey
May 09
RT @NOIRLabAstro:Our latest #CosmoView features the intricate internal structure of spiral #galaxy #NGC1512. The outer tendrils appe… https://t.co/Vin76lo2n5

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Dark Energy Survey @TheDESurvey
May 04
RT @NOIRLabAstro:Our latest #IOTW is a 360-degree panorama featuring the #MilkyWay and several #nebulae within it arching above a nu… https://t.co/WrPvpLy7rz

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Dark Energy Survey @TheDESurvey
May 03
RT @NOIRLabAstro:Our latest photo release features the intricate internal structure of spiral #galaxy #NGC1512. The outer tendrils a… https://t.co/29CMNEruJF

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Dark Energy Survey @TheDESurvey
Apr 25
RT @Fermilab:ICYMI: Physicists are revisiting what they previously assumed about how dark matter interacts with itself. https://t.co/82ODlneZCW

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The Dark Energy Survey

5 hours ago

Congratulations to former DES Director Josh Frieman! ... See MoreSee Less
Fermilab astrophysicist Josh Frieman elected to National Academy of Sciences
news.fnal.gov
Fermilab scientist Josh Frieman, former director of the Dark Energy Survey, has been elected by his peers to membership in the National Academy of Sciences, considered one of the highest honors a scie...
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The Dark Energy Survey

5 days ago

Timeline photosTo celebrate 10 years of DECam operations, NOIRLab will hold an in-person community workshop in Tucson 12–14 September 2022. DECam is a wide-field imager installed at the Blanco Telescope in Cerro Tololo Inter-American Observatory, Chile. The workshop will highlight the outstanding DECam science results of the past 10 years, describe the exciting opportunities with DECam as we move into the era of the Vera C. Rubin Observatory/LSST and other new facilities, and look further into the future for the NOIRLab 4-meter telescopes. Registration is now open at noirlab.edu/science/events/websites/DECam/registration #DiscoverTogether

Image credit: Credit: DES/DOE/FNAL/CTIO/NOIRLab/NSF/AURA/R. Hahn ... See MoreSee Less
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The Dark Energy Survey

2 weeks ago

Timeline photosOur latest #ImageOfTheWeek is a 360-degree panorama featuring the #MilkyWay and several #nebulae within it arching above a number of #telescopes at Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF's NOIRLab.

Various other, more unusual #nightsky phenomena are also visible. The white glow on the left of the image is zodiacal light, arising from interplanetary dust illuminated by the #Sun. The green, orange, and reddish “clouds” near the horizon are #airglow, caused by trace gasses in the upper atmosphere.

For more, please see: noirlab.edu/public/es/images/iotw2218a/?lang

#NOIRLab #DiscoverTogether

Credit: CTIO/NOIRLab/ National Science Foundation (NSF) / AURA / Babak A. Tafreshi ... See MoreSee Less
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Cool!!
The Dark Energy Survey

3 weeks ago

Theorists imagine a different kind of dark matter ... See MoreSee Less
Theorists imagine a different kind of dark matter
www.symmetrymagazine.org
Physicists are revisiting what they previously assumed about how dark matter interacts with itself.
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The Dark Energy Survey

4 weeks ago

Timeline photosNew article in Nature Astronomy supported by the IAU Centre for the Protection of the Dark and Quiet Sky from Satellite Constellation Interference argues that space is also part of our environment and should be preserved: www.washington.edu/news/2022/04/22/space-environmentalism/ #DiscoverTogether

Image credit: M. Lewinsky ... See MoreSee Less
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News

Scientists Leverage HPC and AI to Wrangle the ‘Galaxy Zoo’

July 8, 2019 12:00 pm

The research team developed a new approach to classifying these hundreds of millions of galaxies. Instead of relying on crowdsourced classification, the researchers used knowledge from the state-of-the-art Xception neural network, combined with the datasets generated by the Galaxy Zoo project, to train its deep learning models. They then applied the trained model to galactic images from the Dark Energy Survey (DES) – where it achieved a 99.6% accuracy in identifying spiral and elliptical galaxies.

Three sky surveys completed in preparation for Dark Energy Spectroscopic Instrument

July 8, 2019 12:00 pm

It took three sky surveys — conducted at telescopes in two continents, covering one-third of the visible sky, and requiring almost 1,000 observing nights – to prepare for a new project that will create the largest 3-D map of the universe’s galaxies and glean new insights about the universe’s accelerating expansion. This Dark Energy Spectroscopic Instrument (DESI) project will explore this expansion, driven by a mysterious property known as dark energy, in great detail. It could also make unexpected discoveries during its five-year mission.

Multiple Measurements close in on Dark Energy

May 6, 2019 12:00 pm

An extensive analysis of four different phenomena within the universe points the way to understanding the nature of dark energy, a collaboration between more than 100 scientists reveals. Dark energy – the force that propels the acceleration of the expanding universe – is a mysterious thing. It’s nature, write telescope scientist Timothy Abbott from the Cerro Tololo Inter-American Observatory, in Chile, and colleagues, “is unknown, and understanding its properties and origin is one of the principal challenges in modern physics”. Indeed, there is a lot at stake. Current measurements indicate that dark energy can be smoothly incorporated into the theory of general relativity as a cosmological constant; but, the researchers note, those measurements are far from precise and incorporate a wide range of potential variations.

Viewpoint: Dark Energy Faces Multiple Probes

May 1, 2019 12:00 pm

One of the top goals in cosmology today is understanding the dark energy that is responsible for the accelerated expansion of the Universe. Is the dark energy consistent with the cosmological constant of general relativity—representing a constant energy density filling space homogenously? Or can we find deviations from general relativity on cosmological scales that suggest a more complex nature for gravity? Questions like these motivate the current and next generations of surveys that aim to map out ever larger volumes of the Universe, using a wide variety of probes to constrain the properties of dark energy. The Dark Energy Survey (DES) has now derived such constraints from the combined analysis of four canonical observables related to dark energy: supernovae, baryon acoustic oscillations, gravitational lensing, and galaxy clustering [1]. The resulting bounds confirm what we knew from previous studies, which focused on single probes. But the results indicate that this multiprobe approach could allow surveys in the 2020s to improve such constraints by orders of magnitude, possibly bringing us close to solving the dark energy puzzle.

Supernovae, Dark Energy, and the Fate of Our Universe

April 5, 2019 12:00 pm

What’s the eventual fate of our universe? Is spacetime destined to continue to expand forever? Will it fly apart, tearing even atoms into bits? Or will it crunch back in on itself? New results from Dark Energy Survey supernovae address these and other questions. At present, the fabric of our universe is expanding — and not only that, but the its expansion is accelerating. To explain this phenomenon, we invoke what’s known as dark energy — an unknown form of energy that exists everywhere and exerts a negative pressure, driving the expansion. Since this idea was first proposed, we’ve conducted decades of research to better understand what dark energy is, how much of it there is, and how it influences our universe.

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