Fresh articles

» IOS6 news and fixes
» Strange Martian crater
» 100 Petabits per second
» Artificial life created
» Space rock contains organic molecular feast
» 10 Failed Doomsday Predictions
» Universal phone charger
» Moon buildings
» Epassports RFID danger
» 500Gb optical

 
 

 
 

 Index

Sexy things-> Sexy things (4)
Bulk-> Bulk (15)
Technology-> Technology (42)
Space-> Space (35)
UFO-> UFO (5)
Funny-> Funny (4)
Earth Life-> Earth Life (9)
Internet-> Internet (10)
Health-> Health (1)

 
 

 
 

 Most popular

»X-ray
» Google unifies search results
»Google under water
»Moon buildings
»500Gb optical
»Scientists Levitate Small Animals
»Jet stream is weakening
»Orion new nasa vehicle
»Saturns moon like ocean floor
»How Cells Store Fat

 
 

 
 

 Other articles

»Arctic changes
»Vatican says aliens could exist
»Laser Zaps Viruses
»Self-Healing plastic
»WTC UFO
»Marine Species Collapse by 2048
»Moon buildings
»Windows Vista failures
»Flying Saucer Air Travel
»Bright Idea: Light Bulb Burns Away Tumors
»String of pearls
»Super Computer
»Scientists Melt Diamond
»God particle is near
»Diabetes tattoo
»Russia building nuke barge to power Arctic
»Honda first hydrogen cars
»Southern Ocean saturated with CO2
»Kidney Thefts
»Moon total eclipse

 
 

'Dark energy' pushed universe's growth, astronomer says

NEW YORK -- The Hubble Space Telescope has shown that a mysterious form of energy first conceived by Albert Einstein, then rejected by the famous physicist as his "greatest blunder," appears to have been fueling the expansion of the universe for most of its history.

This so-called "dark energy" has been pushing the universe outward for at least 9 billion years, astronomers said Thursday.

"This is the first time we have significant, discrete data from back then," said Adam Riess, a professor of astronomy at Johns Hopkins University and researcher at NASA's Space Telescope Science Institute.

He and several colleagues used the Hubble to observe 23 supernovae -- exploding white dwarf stars -- so distant that their light took more than half the history of the universe to reach the orbiting telescope. That means the supernovae existed when the universe was less than half its current age of approximately 13.7 billion years.

Because the physics of supernova explosions is extremely well-known, it is possible for the astronomers to gauge not just their distance, but how fast the universe was expanding at the time they went off.

"This finding continues to validate the use of these supernovae as cosmic probes," Riess said.

He and his colleagues describe their research in a paper that is scheduled for publication in the February 10 issue of Astrophysical Journal.

The idea of dark energy was first proposed by Einstein as a means of explaining how the universe could resist collapsing under the pull of gravity. But then Edwin Hubble -- the astronomer for whom the NASA telescope is named -- demonstrated in 1929 that the universe is expanding, not a constant size. That led to the big-bang theory, and Einstein tossed his notion on science's scrap heap.

There it languished until 1998, when astronomers who were using supernova explosions to gauge the expansion of the universe made a shocking observation. It appeared that older supernovae, whose light had traveled a greater distance across space to reach the Hubble telescope, were receding from Earth more slowly than simple big-bang theory would predict. Nearby supernovae were receding more quickly than expected. That could only be true if some mysterious force were causing the expansion of the universe to accelerate over time.

Cosmologists dubbed the force "dark energy," and ever since they've been trying to figure out what it is.

"Dark energy makes us nervous," said Sean Carroll, a theoretical physicist at the California Institute of Technology who was not involved in the supernova study. "It fits the data, but it's not what we really expected."

Answers may come once NASA upgrades the Hubble Space Telescope in a space shuttle mission scheduled for 2008. NASA and the Department of Energy are also planning to launch an orbiting observatory specifically designed to address the mystery in 2011.

Dark energy could be some property of space itself, which is what Einstein was thinking of when he proposed it. Or it could be something akin to an electromagnetic field pushing on the universe. And then there's the possibility that the whole thing is caused by some hitherto undiscovered wrinkle in the laws of gravity.


Copyright 2006 The Associated Press. All rights reserved.This material may not be published, broadcast, rewritten, or redistributed.

 Read this article Email this article

Article © News, Technology, Space, Science - Breaking News and interesting storiesShare


 
 
 
 

You need to login first



Satellite Shooted down

 
  Did you know?...

- Women in ancient Egypt prevented pregnancy with
plugs made of crocodile droppings?

- Based on artifacts and cave paintings, Ice Age women were likely to enjoy sex as much as their male mates?

- In 2005, the average first time for US girls occurred at the age of 17?

- Known aphrodisiacs of the food world include chocolate, oysters and spicy foods?

- That females have a weaker sex drive than men is a  cultural misconception?

- The most common sexual problem among men is premature ejaculation?

- It is a common misconception that pregnancy can’t occur without male orgasm?

- Whether put to use or not, males produce about 300 million sperm every day?
 
 

 
 

 Visit:

CNN Page

NASA Page

BBC UK

Google News

World of Warcraft News

Romanian Web Hosting

Romanian Domain Registrar

.BIZ Domain Registrar

Advertising

Funny Things

Golden Sands Bulgary

Web Hosting News

Web Hosting Romania

Gadgets Resources

Top Video Games Online
 
 




Members

Username
Password:

[New account] [Forgoten password]


 
 

Keyword:

 
 

©21-Sep-2018