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Dark Energy Survey @TheDESurvey

#DESimages (credit: Tom Diehl) What DEScientists see here: "A spiral-like blue galaxy with two yellow galaxies in… https://t.co/nfZMsutanr

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Dark Energy Survey @TheDESurvey

Look familiar? The recently installed Dark Energy Spectroscopic Instrument (DESI) is on the Mayall Telescope at Kit… https://t.co/ah31eJuHED

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Dark Energy Survey @TheDESurvey

#DESimages (galaxy cluster, possible lens, credit: Aurelio Carnero) https://t.co/PcaV8GGzia

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Dark Energy Survey @TheDESurvey

#DESimages ("Galaxies social distancing", credit: Erin Sheldon and Agnès Ferté)😯 https://t.co/1LpH8k2Fp4

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Dark Energy Survey @TheDESurvey

RT @EllaPalmes:My new paper on a statistical standard siren measurement of the Hubble constant using gravitational wave events GW1… https://t.co/BO7cUvFvsi

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The Dark Energy Survey

3 days ago

#DESimages (credit: Tom Diehl)

Comments from DEScientists on what they see here:

"A spiral-like blue galaxy with two yellow galaxies in the foreground." (yellow/green appearance may be due in part to differing quality of different color band images)

"Circular tidal tails?"

"A big floating alien head?"

"Headphones"

"Skull and crossbones"

"The Scream" (upside down) ... See MoreSee Less

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The Dark Energy Survey

6 days ago

Look familiar? The recently installed Dark Energy Spectroscopic Instrument (DESI) is on the Mayall Telescope at Kitt Peak Observatory in Arizona, USA. The Mayall Telescope and the Blanco Telescope at Cerro Tololo Inter-American Observatory in Chile, which is equipped with the Dark Energy Camera and was the site of Dark Energy Survey operations, are identical, both built in the 1970s. ... See MoreSee Less

Five thousand eyes on the skies: Scientists choreograph robots to observe distant galaxies

news.fnal.gov

Scientists have begun operating the Dark Energy Spectroscopic Instrument, or DESI, to create a 3-D map of over 30 million galaxies and quasars that will help them understand the nature of dark energy....

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The Dark Energy Survey

1 week ago

#DESimages (galaxy cluster, possible lens, credit: Aurelio Carnero) ... See MoreSee Less

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The Dark Energy Survey

2 weeks ago

#DESimages ("Galaxies social distancing", credit: Erin Sheldon and Agnès Ferté) 😯 ... See MoreSee Less

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The Dark Energy Survey

2 weeks ago

DEScientist Jessie Muir created this great drawing depicting gravitational lensing! Left: what a group of galaxies would look like if their light arrived uninterrupted at our telescope. Right: what we actually see after light from those galaxies is deflected due to gravitational lensing by other galaxies (in white). The overall effect tends to have galaxies look stretched or 'sheared' into a circular pattern around the 'lens' galaxies causing the deflections.

Most of the matter in the Universe is dark matter, which cannot be seen directly. However, all matter cause gravitational lensing. Studying these gravitational effects is one of the main ways DES is able to study dark matter (in this case, the dark matter and visible matter in the 'lens' galaxies in white.)

See more at: www.jessiemuir.com/cartoons/ ... 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.

© 2020 The Dark Energy Survey