Universe Expanding Faster Than Expected: Nasa

    • PTI
    • Publish Date: Jun 8 2016 4:48PM
    • |
    • Updated Date: Jun 8 2016 4:48PM
Universe Expanding Faster Than Expected: Nasa
Researchers made the discovery by refining the universe''s current expansion rate to unprecedented accuracy, reducing the uncertainty to only 2.4 per cent. (Photo Getty Images)

The universe is expanding 5 to 9 per cent faster than thought, astronomers using Nasa's Hubble Space Telescope have discovered.

 
"This surprising finding may be an important clue to understanding those mysterious parts of the universe that make up 95 per cent of everything and don't emit light, such as dark energy, dark matter, and dark radiation," said study leader and Nobel Laureate Adam Riess of the Space Telescope Science Institute and The Johns Hopkins University in the US.
 
Researchers made the discovery by refining the universe's current expansion rate to unprecedented accuracy, reducing the uncertainty to only 2.4 per cent.
The team made the refinements by developing innovative techniques that improved the precision of distance measurements to faraway galaxies.
 
They looked for galaxies containing both Cepheid stars and Type Ia supernovae. Cepheid stars pulsate at rates that correspond to their true brightness, which can be compared with their apparent brightness as seen from Earth to accurately determine their distance.
 
Type Ia supernovae, another commonly used cosmic yardstick, are exploding stars that flare with the same brightness and are brilliant enough to be seen from relatively longer distances.
 
By measuring about 2,400 Cepheid stars in 19 galaxies and comparing the observed brightness of both types of stars, researchers accurately calculated distances to roughly 300 Type Ia supernovae in far-flung galaxies.
 
They compared those distances with the expansion of space as measured by the stretching of light from receding galaxies.
 
The team used these two values to calculate how fast the universe expands with time, or the Hubble constant.
 
The improved Hubble constant value is 73.2 kilometres per second per megaparsec. A megaparsec equals 3.26 million light-years. The new value means the distance between cosmic objects will double in another 9.8 billion years.
 

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Comments

dhwani mothay SILVER OAKS

very interesting information and lot of information to know!!

Sujay Mohanty Ryan International School

Hope Universe does not shrink like it is actually expanding.

dev Children''s Academy, Ashok Nagar, Kandivli East

We''re becoming more accurate

piyush gupta MOTHER''S GLOBAL.SCH.(PREET VIHAR)

expanding universe ! really ! this simply means more "space" for the ''expanding'' human population.

Gargi Mulay Akshara International School

Very interesting...

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