New Universe map unearths 300,000 more galaxies

A new project found 300,000 previously unseen light sources using a telescope that can detect light sources optical instruments cannot see. Above, galaxy MACS1149-JD1 located 13.28 billion light-years away as seen with the NASA/ESA Hubble Space Telescope in May 2018. (AFP)
Updated 19 February 2019

New Universe map unearths 300,000 more galaxies

  • Discovery literally sheds new light on some of the Universe’s deepest secrets
  • More than 200 astronomers from 18 countries were involved in the study

PARIS: The known Universe just got a lot bigger.
A new map of the night sky published Tuesday charts hundreds of thousands of previously unknown galaxies discovered using a telescope that can detect light sources optical instruments cannot see.
The international team behind the unprecedented space survey said their discovery literally shed new light on some of the Universe’s deepest secrets, including the physics of black holes and how clusters of galaxies evolve.
“This is a new window on the universe,” Cyril Tasse, an astronomer at the Paris Observatory who was involved in the project, said.
“When we saw the first images we were like: ‘What is this?!’ It didn’t look anything at all like what we are used to seeing.”
More than 200 astronomers from 18 countries were involved in the study, which used radio astronomy to look at a segment of sky over the northern hemisphere, and found 300,000 previously unseen light sources thought to be distant galaxies.
Radio astronomy allows scientists to detect radiation produced when massive celestial objects interact.
The team used the Low Frequency Array (LOFAR) telescope in the Netherlands to pick up traces — or “jets” — of ancient radiation produced when galaxies merge. These jets, previously undetected, can extend over millions of light years.
“With radio observations we can detect radiation from the tenuous medium that exists between galaxies,” said Amanda Wilber, of the University of Hamburg.
“LOFAR allows us to detect many more of these sources and understand what is powering them.”
The discovery of the new light sources may also help scientists better understand the behavior of one of space’s most enigmatic phenomena.
Black holes — which have a gravitational pull so strong that no matter can escape them — emit radiation when they engulf other high-mass objects such as stars and gas clouds.
Tasse said the new observation technique would allow astronomers to compare black holes over time to see how they form and develop.
“If you look at an active black hole, the jets (of radiation) disappear after millions of years, and you won’t see them at a higher frequency (of light),” he said.
“But at a lower frequency they continue to emit these jets for hundreds of millions of years, so we can see far older electrons.”
The Hubble telescope has produced images that lead scientists to believe there are more than 100 billion galaxies in the Universe, although many are too old and distant to be observed using traditional detection techniques.
The map created by the LOFAR observations, part of which was published in the journal Astronomy & Astrophysics, contains data equivalent to ten million DVDs yet charts just two percent of the sky.
The LOFAR telescope is made up of a Europe-wide network of radio antenna across seven countries, forming the equivalent of a 1,300-kilometer diameter satellite dish.
The team plans to create high-resolution images of the entire northern sky, which they say will reveal as many as 15 million as-yet undetected radio sources.
“The oldest objects in the Universe are around 11-12 billion light years old,” said Tasse. “So we are going to see lots more of these objects.”


UAE’s MeznSat satellite set for launch in Russia

Updated 28 September 2020

UAE’s MeznSat satellite set for launch in Russia

DUBAI: MeznSat, the UAE Space Agency’s latest satellite, is set for launch from the Plesetsk space center in northwestern Russia today as part of the country’s ambitious space strategy.

MeznSat, which detects greenhouse gas concentrations, was built by students from the Khalifa University and the American University of Ras Al Khaimah. The probe once in orbit will send data to the two universities’ ground stations, where it will be analyzed and processed, state news agency WAM reported

“Climate change has widely been attributed to the increase in GHGs in the atmosphere as a result of human activities. The impacts of climate change are expected to include shortage of water quantity and quality in most arid and semi-arid areas, and low agricultural productivity throughout the tropics and subtropics, accompanied by damage to ecosystems and biodiversity in these areas, and changes in forests and other ecosystems,” the space agency said in its website.

“Carbon Dioxide and Methane are the two most prevalent Greenhouse gases. Both emissions (methane and carbon dioxide) have to be addressed and monitored in order to effectively reduce the impact of climate change,” it added

Sheikh Mohammed bin Rashid Al-Maktoum, the Ruler of Dubai and Vice President of UAE, earlier reviewed plans to send the first Arab mission to the moon by 2024 to be manned by Emirati astronauts.

The UAE’s new 2021-2031 strategy particularly covers the Mars Exploration Project “Hope Probe” 2117 Strategy, the Astronaut Program, the Satellite Development Program and the UAE Space Sector Sustainability Program.