Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



STELLAR CHEMISTRY
Scientists find missing baryons -- half the universe's missing matter
by Brooks Hays
Washington (UPI) Oct 9, 2017


Two separate teams of researchers have found half of the universe's hidden matter, partially solving a mystery that has long troubled astronomers.

When it comes to the search for missing matter, dark matter -- the mysterious, invisible material accounting for roughly 80 precent of the mass of the universe -- hogs the headlines. But astronomers have also struggled to find a lot of visible matter, too.

Models predict there should be roughly twice as much visible matter as is routinely observed by surveys of the cosmos.

Now, a pair of research teams have found the missing matter. The matter is made up of particles called baryons, heavy subatomic particles made up of three quarks. Astronomers discovered the missing baryons among strands of hot, diffuse gas linking the universe's galaxies together -- the faintest portions of what's known as the cosmic web.

"The missing baryon problem is solved," astronomer Hideki Tanimura told New Scientist.

Tanimura, a researcher at the Institute of Space Astrophysics in Orsay, France, headed one of the scientific teams responsible for discovering the missing particles. Anna de Graaff, a researcher at the University of Edinburgh, led the other team.

Because these isolated gas filaments aren't very hot, they don't give off much energy, making them difficult to observe with X-ray telescopes. But researchers were able to confirm their existence using a phenomenon known as the Sunyaev-Zel'dovich effect, which describes the behavior of light left over from the Big Bang as it travels through hot gas.

As the light passes through the filaments, some of it scatters off the electrons in the gas. The ionized gas causes a distortion in the cosmic microwave background.

Astronomers have previously attempted to map the phenomenon using observations from the Planck satellite. And scientists have successfully identified missing baryons among extremely hot gas filaments.

But many of the cosmic web's filaments are too scattered to be detected. Using data from the Sloan Digital Sky Survey, scientists identified galaxies that should be connected by filaments of diffuse gas.

They then overlaid maps of Planck signals corresponding with the regions of interest. The technique revealed masses of strands too faint to been seen on their own.

One group found filaments six times denser than the other, but further analysis suggests the discrepancy can be explained by the fact that some Planck renderings were recorded at varying distances.

The works by the two teams were published online this week. The two papers are both being considered for publication in the Monthly Notices of the Royal Astronomical Society.

"Everybody sort of knows that it has to be there, but this is the first time that somebody -- two different groups, no less -- has come up with a definitive detection," said Ralph Kraft at the Harvard-Smithsonian Center for Astrophysics. "This goes a long way toward showing that many of our ideas of how galaxies form and how structures form over the history of the universe are pretty much correct."

STELLAR CHEMISTRY
Astronomers reveal evidence of dynamical dark energy
Portsmouth, UK (SPX) Oct 06, 2017
An international research team, including astronomers from the University of Portsmouth, has revealed evidence of dynamical dark energy. The discovery, recently published in the journal Nature Astronomy, found that the nature of dark energy may not be the cosmological constant introduced by Albert Einstein 100 years ago, which is crucial for the study of dark energy. Lead author of the stu ... read more

Related Links
Stellar Chemistry, The Universe And All Within It


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

STELLAR CHEMISTRY
Alaska antenna to improve NASA's space communications system

USNO Astronomers Measure New Distances To Nearby Stars

NASA May Extend BEAM's Time on the International Space Station

OECD calls for tourism to be more sustainable

STELLAR CHEMISTRY
Arianespace to launch COSMO-SkyMed satellites manufactured by Thales

New Zealand opens first rocket launch site

Arianespace signs contract for 10 Vega and Vega C launchers

Launch Vehicle and Missile Ascent Trajectories

STELLAR CHEMISTRY
ASU examines Mars' moon Phobos in a different light

Fresh Look at Old Data Yields Surprise Near Martian Equator

Methane belches kept water flowing on ancient Mars

Another Chance to Put Your Name on Mars

STELLAR CHEMISTRY
UN official commends China's role in space cooperation

China launches three satellites

Mars probe to carry 13 types of payload on 2020 mission

China's cargo spacecraft separates from Tiangong-2 space lab

STELLAR CHEMISTRY
SpaceX launches 10 satellites for Iridium mobile network

L-Band Satellite Operators Need To Reposition

Lockheed Martin Completes First Flexible Solar Array for LM 2100 Satellite

Private companies are launching a new space race

STELLAR CHEMISTRY
Electrically heated textiles now possible via UMass Amherst research

Unexpected discovery leads to new theory of liquid streaming

Sputnik, the tiny sphere that launched the space race

Saab supplying radar to U.S. Coast Guard

STELLAR CHEMISTRY
Biomarker Found In Space Complicates Search For Life On Exoplanets

Are Self-Replicating Starships Practical

New telescope attachment allows ground-based observations of new worlds

The Super-Earth that Came Home for Dinner

STELLAR CHEMISTRY
Helicopter test for Jupiter icy moons radar

Solving the Mystery of Pluto's Giant Blades of Ice

Global Aerospace Corporation to present Pluto lander concept to NASA

Pluto features given first official names




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement