Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. 24/7 Space News .




STELLAR CHEMISTRY
Dartmouth researchers shed new light on dark energy, cosmic speed-up
by Staff Writers
Hanover NH (SPX) Nov 11, 2013


The detailed, all-sky picture of the Cosmic Microwave Background in the infant universe reveals 13.77 billion year old temperature fluctuations (shown as color differences) that correspond to the seeds that grew to become the galaxies. Credit: NASA/WMAP Science Team.

In a new study, Dartmouth researchers rule out a controversial theory that the accelerating expansion of the universe is an illusion.

While the findings don't explain the cosmic speed-up, they eliminate one provocative possibility that our planet, solar system and galaxy are at the center of the universe and that there is no dark energy. The findings appear in the journal Physical Review D. A PDF of the study is available on request.

The 2011 Nobel Prize was awarded for the discovery that the expansion of the universe is accelerating. One leading idea to explain the acceleration is a new, mysterious substance called dark energy, which is thought to make up nearly three-fourths of the energy of the universe.

But another alternative is that the Earth, our solar system and Milky Way galaxy are at the center of the universe. That theory violates the standard assumption that the universe has no center, but if true, then cosmic acceleration could be explained without dark energy or any new laws of physics.

But Dartmouth researchers found that this model can't hold up to other observational tests. The sky glows with light left over from the Big Bang, also known as the Cosmic Microwave Background, so they calculated how that glow would be affected. Their findings show that the model's prediction is completely contrary to the glow that has been measured.

"Essentially, we held a mirror up to the universe and asked if the reflection was special," says Robert Caldwell, a professor of physics and astronomy who co-wrote the article with undergraduate physics major Nina Maksimova.

"The reflection shows that we do not appear to live in a special location, and decisively excludes this explanation for the universe's accelerating expansion. It would be a great relief to be able to understand a basic problem of cosmology within the known laws of physics, but our research is an important step in explaining the physics responsible for the cosmic acceleration."

.


Related Links
Dartmouth College
Stellar Chemistry, The Universe And All Within It






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

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




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





STELLAR CHEMISTRY
First results from LUX dark matter detector rule out some candidates
Davis CA (SPX) Nov 04, 2013
Results from the first run of the Large Underground Xenon (LUX) experiment operating a mile underground in the Black Hills of South Dakota, have proven the detector's sensitivity and ruled out some possible candidates for a dark matter particle. Initial results from 85 days worth of accumulated data were announced at a seminar Oct. 30 at the Sanford Underground Research Facility in Lead, S ... read more


STELLAR CHEMISTRY
NASA's GRAIL Mission Puts a New Face on the Moon

Moon mission yields clues to face of 'man in the moon'

Shanghai-built lunar rover set for lunar landing

Crowdfunded Lunar Spacecraft Reaches Funding Milestone

STELLAR CHEMISTRY
India Mars mission back on track after engine glitch: scientists

Opportunity Maneuvering Around A Dune Field

ExoMars Lander Module Named Schiaparelli

Prolific NASA Mars Orbiter Passes Big Data Milestone

STELLAR CHEMISTRY
NASA says new deep space vehicle on time for 2014 test

NASA's Orion Sees Flawless Fairing Separation in Second Test

Lockheed Martin Team Tests Orion's Protective Panels

UCF Lands NASA-Funded Center, Linchpin for Future Space Missions

STELLAR CHEMISTRY
China shows off moon rover model before space launch

China providing space training

China launches experimental satellite Shijian-16

China Moon Rover A New Opportunity To Explore Our Nearest Neighbor

STELLAR CHEMISTRY
Russians take Olympic torch on historic spacewalk

Russia launches Sochi Olympic torch into space

Spaceflight Joins with NanoRacks to Deploy Satellites from the ISS

Crew Completes Preparations for Soyuz Move

STELLAR CHEMISTRY
ASTRA 5B lands in French Guiana for its upcoming Ariane 5 flight

Kazakhstan say Baikonur launch site may be open to Western countries

ESA Swarm launch postponed

Europe's fifth ATV for launch by Arianespace begins its pre-flight checkout at the Spaceport

STELLAR CHEMISTRY
NASA Kepler Results Usher in a New Era of Astronomy

Astronomers answer key question: How common are habitable planets?

One in five Sun-like stars may have Earth-like planets

Mystery World Baffles Astronomers

STELLAR CHEMISTRY
Wageningen UR innovates in the ultra-low temperature freezing of research material

GOCE gives in to gravity

European science satellite to break up late Sunday

New chemistry: Drawing and writing in liquid with light




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal 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. 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