Radar satellite launched by India and NASA will track minuscule changes to Earth’s land and ice

This photo provided by NASA shows part of the NISAR (NASA-ISRO Synthetic Aperture Radar) satellite resting in a thermal vacuum chamber in August 2020 at NASA’s Jet Propulsion Laboratory in La Cañada Flintridge, California (AP)
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Updated 30 July 2025
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Radar satellite launched by India and NASA will track minuscule changes to Earth’s land and ice

  • Rocketing to orbit from India, the satellite will survey virtually all of Earth’s terrain multiple times
  • Fox led a small NASA delegation to India for the launch

FLORIDA: NASA and India paired up to launch an Earth-mapping satellite on Wednesday capable of tracking even the slightest shifts in land and ice.

The $1.3 billion mission will help forecasters and first responders stay one step ahead of floods, landslides, volcanic eruptions and other disasters, according to scientists.

Rocketing to orbit from India, the satellite will survey virtually all of Earth’s terrain multiple times. Its two radars — one from the US and the other from India — will operate day and night, peering through clouds, rain and foliage to collect troves of data in extraordinary detail.

Microwave signals beamed down to Earth from the dual radars will bounce back up to the satellite’s super-sized antenna reflector perched at the end of a boom like a beach umbrella. Scientists will compare the incoming and outgoing signals as the spacecraft passes over the same locations twice every 12 days, teasing out changes as small as a fraction of an inch (1 centimeter).

It’s “a first-of-its-kind, jewel radar satellite that will change the way we study our home planet and better predict a natural disaster before it strikes,” NASA’s science mission chief Nicky Fox said ahead of liftoff.

Fox led a small NASA delegation to India for the launch.

It will take a full week to extend the satellite’s 30-foot (9-meter) boom and open the 39-foot-in-diameter (12-meter) drum-shaped reflector made of gold-plated wire mesh. Science operations should begin by the end of October.

Among the satellite’s most pressing measurements: melting glaciers and polar ice sheets; shifting groundwater supplies; motion and stress of land surfaces prompting landslides and earthquakes; and forest and wetland disruptions boosting carbon dioxide and methane emissions.

NASA is contributing $1.2 billion to the three-year mission; it supplied the low-frequency radar and reflector. The Indian Space Research Organization’s $91 million share includes the higher-frequency radar and main satellite structure, as well as the launch from a barrier island in the Bay of Bengal. It’s the biggest space collaboration between the two countries.

The satellite called NISAR — short for NASA-ISRO Synthetic Aperture Radar — will operate from a near-polar-circling orbit 464 miles (747 kilometers) high. It will join dozens of Earth observation missions already in operation by the US and India.


UN peacekeepers defy South Sudan military’s order to leave opposition-held town

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UN peacekeepers defy South Sudan military’s order to leave opposition-held town

JUBA, South Sudan: The United Nations Mission in South Sudan said Monday that it would not comply with a government order to shut down its base in Akobo, an opposition stronghold near the Ethiopian border where tens of thousands of refugees have fled.
On Friday, the South Sudanese army ordered UN peacekeepers as well as NGOs and civilians to vacate the town ahead of a planned assault.
But the mission refused to leave and said it would provide “a protective presence for civilians” in the town, adding that the safety and security of its personnel “must be fully respected at all times.”
The UN Mission said it was engaging “intensively with national, state and local stakeholders” regarding this order. “Any military operations in and around Akobo gravely endanger the safety and security of civilians,” said mission chief Anita Kiki Gbeho.
The South Sudanese government has been fighting opposition forces since a 2018 peace deal broke down about a year ago.
A dramatic escalation took place in December 2025, when opposition forces seized several government outposts in northern Jonglei. A government counter-offensive repelled their forces a month later and displaced over 280,000 people. Tens of thousands have sought refuge in Akobo, where a small contingent of UN peacekeepers is stationed.
Fearing the looming government assault on Akobo, humanitarian workers were evacuated over the weekend, and a mass exodus of the population has also begun.
Local officials contacted by the The Associated Press said fleeing civilians faced danger and widespread shortages of essential supplies. Dual Diew, the Akobo County health director, who has fled to Ethiopia, said there were 84 wounded patients at the hospital. “We have most of them with us here now,” he said, adding that they lack medicine and basic nursing equipment.
Christophe Garnier, the leader of Doctors Without Borders in South Sudan said the organization had to evacuate its staff from Akobo on Saturday and learned of the subsequent looting of its hospital and the ransacking of its office.
“People in Akobo must now either flee without protection or remain at risk of being killed, while losing access to health care and other essential services,” he said.
The three Western governments that have played a major role in the peace process — the U.S, UK, and Norway — sent a letter to President Kiir on Monday urging that the army’s evacuation order be revoked and warning of “further deaths, displacement and suffering for the South Sudanese people” if the offensive on Akobo is implemented.