So when will the world end? According to a presentation by astronomers at the General Assembly of the International Astronomical Union in Hawaii, we will have at least a few more billion years. The conclusion was based from data about our dying universe.
An international team of astronomers studying 200,000 galaxies has measured the energy generated within a large portion of space more precisely than ever before, discovering that it’s only half what it was 2 billion years ago and fading – the Universe is slowly dying.
Researchers from the International Centre for Radio Astronomy Research (ICRAR) in Western Australia used seven of the world’s most powerful telescopes to observe galaxies at 21 different wavelengths from the far ultraviolet to the far infrared.
Initial observations were conducted using the Anglo-Australian Telescope in New South Wales and supporting observations were made by two orbiting space telescopes operated by NASA and another belonging to the European Space Agency.
The research is part of the Galaxy and Mass Assembly (GAMA) project, the largest multi-wavelength survey ever put together.
“We used as many space and ground-based telescopes we could get our hands on, to measure the energy output of over 200,000 galaxies across as broad a wavelength range as possible,” says ICRAR Professor Simon Driver, who presented the findings at the International Astronomical Union’s General Assembly in Honolulu.
The survey data, released to astronomers around the world, includes 200,000 galaxies each measured at 21 wavelengths from the ultraviolet to the far infrared and will help scientists better understand how different types of galaxies form.
The fact that the Universe is slowly fading has been known since the late 1990s but this work shows that it’s happening across all wavelengths from the ultraviolet to the infrared, representing the most comprehensive assessment of the energy output of the nearby Universe.
The team of researchers hope to expand the work to map energy production over the entire history of the Universe. To do this, they will use a swathe of new facilities including the world’s largest radio telescope, the Square Kilometre Array, due to be built in Australia and South Africa in the next decade.
Reference of the original publication:
‘Galaxy And Mass Assembly (GAMA): Panchromatic Data Release (far-UV—far-IR) and the low-z energy budget’ submitted to the Monthly Notices of the Royal Astronomical Society. Available from http://www.simondriver.org/mwavev02.pdf