Cosmic cartographers release a more accurate map of the universes matter

Date:
Wed, 01 Feb 2023 14:00:00 +0000

Description:
Scientists have released a new survey of all the matter in the universe,
using data taken by the Dark Energy Survey in Chile and the South Pole Telescope. Andreas Papadopoulos Its another step in understanding our 13 billion year-old universe. The post Cosmic cartographers release a more accurate map of the universes matter appeared first on Popular Science .

FULL STORY ====================================================================== Scientists have released a new survey of all the matter in the universe,
using data taken by the Dark Energy Survey in Chile and the South Pole Telescope. Andreas Papadopoulos

When the universe first began about 13 billion years ago , all of the matter that eventually formed the galaxies, stars, and planets of today was flung around like paint splattering from a paintbrush.

Now, an international group of over 150 scientists and researchers have released some of the most precise measurements ever made of how all of this matter is distributed across the universe. With a map of that matter in the present, scientists can try to understand the forces that shaped the
evolution of the universe .

[Related: A key part of the Big Bang remains troublingly elusive. ]

The team combined data from the Dark Energy Survey (DES) and the South Pole Telescope , which conducted two major telescope surveys of the present universe. The analysis was published in the journal Physical Review D as
three articles on January 31 .

In the analysis, the team found that matter isnt as clumpy as previously believed , adding to a body of evidence that something might be missing from the existing standard model of the universe.

By tracing the path of this matter to see where everything ended up, scientists can try to recreate what happened during the Big Bang and what forces were needed for such a massive explosion.

To create this map, an enormous amount of data was analyzed from the DES and South Pole Telescope. The DES surveyed the night sky for six years from atop
a mountain in Chile, while the South Pole Telescope scoured the universe for faint traces of traveling radiation that date back to the first moments of
our universe. By overlaying maps of the sky from the Dark Energy Survey telescope (at left) and the South Pole Telescope (at right), the team could assemble a map of how the matter is distributedcrucial to understand the forces that shape the universe. CREDIT: Yuuki Omori


Scientists were able to infer where all of the universes matter ended up and are offering a more accurate matter map by rigorously analyzing both data sets. It is more precise than previous measurementsthat is, it narrows down the possibilities for where this matter wound upcompared to previous
analyses, the authors said .

Combining two different skygazing methods reduced the chance of a measurement error throwing off the results. It functions like a cross-check, so it
becomes a much more robust measurement than if you just used one or the
other, said co-author Chihway Chang, an astrophysicist from the University of Chicago, in a statement .

The analyses looked at gravitational lensing , which occurs when some of the light traveling across the universe can be slightly bent when it passes objects like galaxies that contain a lot of gravity.

Regular matter and dark matter can be caught by this method. Dark matter is
an invisible form of matter that makes up most of the universes mass, but it is so mysterious that scientists know more about what it isnt than what it is . It doesnt emit light, so it cant be a planet of stars, but it also isnt a bunch of black holes.

[Related: A key part of the Big Bang remains troublingly elusive. ]

While most of the results fit perfectly with the currently accepted best theory of the universe, there are some signs of a crack in the theory.

It seems like there are slightly less fluctuations in the current universe, than we would predict assuming our standard cosmological model anchored to
the early universe, said analysis coauthor and University of Hawaii astrophysicist Eric Baxter, in a statement .

Even if something is missing from todays matter models, the team believes
that using information from two different telescope surveys is a promising strategy for the future of astrophysics.

I think this exercise showed both the challenges and benefits of doing these kinds of analyses, Chang said . Theres a lot of new things you can do when
you combine these different angles of looking at the universe.

The post Cosmic cartographers release a more accurate map of the universes matter appeared first on Popular Science . Articles may contain affiliate links which enable us to share in the revenue of any purchases made.



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Link to news story:
https://www.popsci.com/science/universe-matter-map/


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