Social Media Sidebar


Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

Just because something doesn’t do what you planned it to do doesn’t mean it’s useless.


Thomas Edison

The Universe is expanding faster than physics can explain

Posted in Science on 18th Apr, 2016 07:34 PM by AlexMuller

The most precise measurement ever of the current rate of expansion of the Universe has been achieved by physicists. This new measurement will force us to rethink how dark matter and dark energy have been influencing the Universe and that means something in the standard model of particle physics has to change.

"I think that there is something in the standard cosmological model that we don't understand," lead researcher Adam Riess from Johns Hopkins University, who also co-discovered dark energy back in 1998, told Davide Castelvecchi at Nature.
While invisible dark matter is thought to make up 27 percent of the Universe, and visible matter a measly 5 percent, dark energy is estimated to make up a whopping 68 percent of the known Universe, and the way all three interact could explain why everything has been expanding since the beginning of time.
According to the accepted model of cosmology, the biggest influence on the evolution of the Universe is the competition between dark matter and dark energy. While the gravitational pull of dark matter appears to be slowing down the expansion of the Universe, dark energy seems to be tugging it in the opposite direction to make it accelerate.  
Astrophysicists were able to figure all this out thanks to measurements of radiation left over from the Big Bang, which we can now observe as the Cosmic Microwave Background, or CMB. 
"For years, those predictions have disagreed with direct measurements of the current rate of cosmic expansion - also known as the Hubble constant," says Castelvecchi. "But until now the error margins in this constant were large enough that the disagreement could be ignored."
Now Riess and his colleagues have found another way to measure the rate of expansion - the brightness of certain types of celestial objects, such as stars and supernovae, known as 'standard candles'.
As Kelly Dickerson explains for, standard candles are thought to emit the exact same level of brightness, which means physicists can use them as markers to measure how fast the Universe is expanding away from us. 
Riess’s team analysed 18 standard candles using hindreds of hours of data from the Hubble Space Telescope, and calculated that the speed of expansion is about 8 percent faster than the Planck’s measurements predicted. 
"If this new measurement is accurate - and our maps of the CMB are also accurate - then something about our fundamental understanding of the Universe is wrong," says Dickerson. 
These results, which have been posted to pre-print website and are awaiting peer-review, have the potential of "becoming transformational in cosmology", cosmologist Kevork Abazajian from the University of California, who was not involved in the study, told Nature.  
We’re going to have to sit tight and wait for these results to be independently confirmed or disproved, but we’ve been hearing pretty often recently of things happening out in our Universe that challenge our current laws of physics, so something’s probably gonna have to give eventually.

Tags: spaceastronomyuniversephysicscosmologyresearch

Read original article » Back to category


Author: Guest
Posted: 2016-05-06
sandrine hemidy20 août 2012Je viens de découvrir votre magazine!! J’adore! je viens tout juste de rentrer d’ un voyage en Australie ou Melbourne et Fitzroy Street reste une source d&nspuo;irsqiration sans fin dans le secteur du vintage! Avez vous des contacts pour travailler dans ce domaine? je recherche un emploi dans une boutique ou même dans votre magazine pourquoi pas!!!Sandrine Reply


Recent headlines

  • Posted in Science on 2018-04-20 16:52:03
    Europe's Mars rover takes more
    Posted in Science on 2018-04-20 16:46:43
    Scientists discover protein behind motor neurone more
    Posted in Hardware on 2018-04-20 16:39:19
    SpaceX finally Falcon flings NASA's TESS into more
    Posted in Science on 2018-04-18 23:02:22
    Clean Energy is Happening, With or Without the more
    Posted in Science on 2018-04-18 22:56:16
    One machine to rule them all: A 'Master Algorithm' more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs, more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target more

Recent Blog Posts

  • Posted by AlexMuller
    In five years quantum computing will be more
    Posted by AlexMuller
    Google partners with Johnson and Johnson to make lower more
    Posted by AlexMuller
    Electron holography microscope with spatial resolution down more
    Posted by AlexMuller
    Lower cost advanced Nuclear power could dominate future US more
    Posted by AlexMuller
    Why Hasn’t AI Mastered Language Translation? more

Login to your Account

Login to your PlanetTech Account here

Remember me

Create a New Account

You just need username and password

The following errors occured:
Verify password:
Remember me