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Dark Energy Survey @TheDESurvey

M-dwarfs are the least massive stars, but still weigh as much as 24 trillion trillion elephants, 2.1 billion trilli… https://t.co/wRQTZi0CrG

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Dark Energy Survey @TheDESurvey

#DESimages (Local Group galaxy IC5152, credit: Erin Sheldon) https://t.co/L4pqFYcSRx

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Dark Energy Survey @TheDESurvey

RT @EFEciencia:El primer catálogo de "enanas marrones" incluye más de 10.000 estrellas @CIEMAT_Moncloa @theDESurvey https://t.co/7QFwmkRnsA

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The meeting is over, but we're still on some Brighton buses! https://t.co/0H1qvq1Alp

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Dark Energy Survey @TheDESurvey

Our week-long collaboration meeting has come to a close. Thanks to everyone at the University of Sussex who made it… https://t.co/DbcTNiyWW3

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The Dark Energy Survey

4 days ago

M-dwarfs are the least massive stars, but still weigh as much as 24 trillion trillion elephants, 2.1 billion trillion cruise ships, or 26 thousand Earths! #darkbites ... See MoreSee Less

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The Dark Energy Survey

6 days ago

#DESimages (Local Group galaxy IC5152, credit: Erin Sheldon) ... See MoreSee Less

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The Dark Energy Survey

1 week ago

The meeting is over, but we're still on some Brighton buses! ... See MoreSee Less

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The Dark Energy Survey

1 week ago

Our week-long collaboration meeting has come to a close. Thanks to everyone at the University of Sussex who made it possible. We made progress on lots of exciting projects and we expect quite a few publications in the next 6 months. Stay tuned! ... See MoreSee Less

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The Dark Energy Survey

2 weeks ago

Our week in Brighton is almost over! DEScientists gathered for the traditional DES dinner. The table decorations were very thematic for our astronomy meeting on the coast. ... 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.

© 2019 The Dark Energy Survey