Science & Technology
NASA rover finds fresh evidence of the warm and wet past of Mars
A mineral called siderite found abundantly in rock drilled by a NASA rover on the surface of Mars is providing fresh evidence of the planet’s warmer and wetter ancient past when it boasted substantial bodies of water and potentially harbored life.
The Curiosity rover, which landed on Mars in 2012 to explore whether Earth’s planetary neighbor was ever able to support microbial life, found the mineral in rock samples drilled at three locations in 2022 and 2023 inside Gale crater, a large impact basin with a mountain in the middle, Reuters reported.
Siderite is an iron carbonate mineral. Its presence in sedimentary rocks formed billions of years ago offers evidence that Mars once had a dense atmosphere rich in carbon dioxide, a gas that would have warmed the planet through the greenhouse effect to the point that it could sustain bodies of liquid water on its surface.
There are features on the Martian landscape that many scientists have interpreted as signs that liquid water once flowed across its surface, with potential oceans, lakes and rivers considered as possible habitats for past microbial life.
Carbon dioxide is the main climate-regulating greenhouse gas on Earth, as it is on Mars and Venus. Its presence in the atmosphere traps heat from the sun, warming the climate.
Until now, evidence indicating the Martian atmosphere previously was rich in carbon dioxide has been sparse. The hypothesis is that when the atmosphere – for reasons not fully understood – evolved from thick and rich in carbon dioxide to thin and starved of this gas, the carbon through geochemical processes became entombed in rocks in the planet’s crust as a carbonate mineral.
The samples obtained by Curiosity, which drills 1.2 to 1.6 inches (3-4 centimeters) down into rock to study its chemical and mineral composition, lend weight to this notion. The samples contained up to 10.5% siderite by weight, as determined by an instrument onboard the car-sized, six-wheeled rover.
“One of the longstanding mysteries in the study of Martian planetary evolution and habitability is: if large amounts of carbon dioxide were required to warm the planet and stabilize liquid water, why are there so few detections of carbonate minerals on the Martian surface?” said University of Calgary geochemist Benjamin Tutolo, a participating scientist on NASA’s Mars Science Laboratory Curiosity rover team and lead author of the study published on Thursday in the journal Science, opens new tab.
“Models predict that carbonate minerals should be widespread. But, to date, rover-based investigations and satellite-based orbital surveys of the Martian surface had found little evidence of their presence,” Tutolo added.
Because rock similar to that sampled by the rover has been identified globally on Mars, the researchers suspect it too contains an abundance of carbonate minerals and may hold a substantial portion of the carbon dioxide that once warmed Mars.
The Gale crater sedimentary rocks – sandstones and mudstones – are thought to have been deposited around 3.5 billion years ago, when this was the site of a lake and before the Martian climate underwent a dramatic change.
“The shift of Mars’ surface from more habitable in the past, to apparently sterile today, is the largest-known environmental catastrophe,” said planetary scientist and study co-author Edwin Kite of the University of Chicago and Astera Institute.
“We do not know the cause of this change, but Mars has a very thin carbon dioxide atmosphere today, and there is evidence that the atmosphere was thicker in the past. This puts a premium on understanding where the carbon went, so discovering a major unsuspected deposit of carbon-rich materials is an important new clue,” Kite added.
The rover’s findings offer insight into the carbon cycle on ancient Mars.
On Earth, volcanoes spew carbon dioxide into the atmosphere, and the gas is absorbed by surface waters – mainly the ocean – and combines with elements such as calcium to form limestone rock. Through the geological process called plate tectonics, this rock is reheated and the carbon is ultimately released again into the atmosphere through volcanism. Mars, however, lacks plate tectonics.
“The important feature of the ancient Martian carbon cycle that we outline in this study is that it was imbalanced. In other words, substantially more carbon dioxide seems to have been sequestered into the rocks than was subsequently released back into the atmosphere,” Tutolo said.
“Models of Martian climate evolution can now incorporate our new analyses, and in turn, help to refine the role of this imbalanced carbon cycle in maintaining, and ultimately losing, habitability over Mars’ planetary history,” Tutolo added.
Science & Technology
Trump administration set to receive $10 billion fee for brokering TikTok deal, WSJ reports
Vice President JD Vance had in September said that the new U.S. company will be valued at around $14 billion.
President Donald Trump’s administration is set to receive a roughly $10 billion fee from investors in the recently completed deal to take control of TikTok’s U.S. business, the Wall Street Journal reported on Friday, citing people familiar with the matter.
TikTok’s Chinese owner, ByteDance, in January finalized a deal to establish a majority American-owned joint venture that will secure U.S. data, to avoid a U.S. ban on the short video app used by over 200 million Americans.
TikTok USDS Joint Venture LLC will secure U.S. user data, apps and algorithms through data privacy and cybersecurity measures. It disclosed few details about the divestiture.
Vice President JD Vance had in September said that the new U.S. company will be valued at around $14 billion.
The payment is part of the agreement through which investors friendly with the administration gained control of TikTok’s U.S. operations from ByteDance, WSJ said. It is on top of the investments already made to establish a new entity to operate the app in the U.S.
Investors Oracle (ORCL.N), Silver Lake, Abu Dhabi’s MGX and other backers paid about $2.5 billion to the Treasury Department when the deal closed and are to make a number of subsequent payments until the total reaches $10 billion, per the Journal.
TikTok and the White House did not immediately respond to Reuters requests for comment.
Officials from the administration have said the fee is justified, citing Trump’s role in rescuing TikTok’s U.S. operations and guiding negotiations with China to complete the deal while tackling lawmakers’ concerns over national security, according to WSJ.
Earlier this month, Trump and U.S. Attorney General Pam Bondi were sued by retail investors in two social media rivals of TikTok seeking to reverse the U.S. president’s approval of a deal by the company’s Chinese owner ByteDance to form a majority American-owned joint venture.
Science & Technology
NASA eyes March 6 launch of astronaut moon mission
Artemis program managers completed a comprehensive simulation of the Space Launch System’s launch-day countdown, but said remaining work could still push the launch date further into March.
NASA officials said the agency was targeting March 6 for the launch of four astronauts around the moon and back as part of its Artemis II mission after overcoming rocket-fueling snags in a second key launch rehearsal this week, but cautioned that remaining prep work could warrant more time.
The U.S. space agency on Thursday night capped a nearly 50-hour rehearsal of the Artemis II launch countdown, fueling the rocket with some 730,000 gallons of propellant without running into the pesky hydrogen leaks that hobbled an initial rehearsal last month, officials said during a news conference.
Artemis program managers were elated that the Wet Dress Rehearsal, a comprehensive simulation of the Space Launch System’s launch-day countdown, went smoothly, but said remaining work ahead could still push the launch date further into NASA’s March launch window.
“I felt like last night was a big step in us earning our right to fly. So, felt really good, very proud of the team,” said NASA launch director Charlie Blackwell-Thompson.
Remaining work includes testing the rocket’s flight termination system and conducting a sweeping Flight Readiness Review, a day-long meeting of agency management during which they effectively double-check all rocket hardware and mission procedures before liftoff. – Reuters
Science & Technology
Musk’s Starlink faces high-profile security test in Iran crackdown
Starlink, which is harder for Iran to tamper with than cable and cellphone tower networks, has become crucial for documenting events on the ground.
Iran’s crackdown on dissidents is shaping up as one of the toughest security tests yet for Elon Musk’s Starlink, which has served as a lifeline against state-imposed internet blackouts since its deployment during the war in Ukraine, Reuters reported.
SpaceX, which owns Starlink, made the satellite service free for Iranians this week, placing Musk’s space company at the center of another geopolitical hot spot and pitting a team of U.S.-based engineers against a regional power armed with satellite jammers and signal-spoofing tactics, according to activists, analysts and researchers.
How SpaceX withstands Iranian attacks on its most lucrative line of business is expected to be closely watched by U.S. military forces and intelligence agencies that use Starlink and its military-grade variant Starshield, as well as China, whose own nascent satellite internet constellations are set to rival Starlink in the coming years. With SpaceX weighing a public listing this year, the situation in Iran also represents a high-profile showcase for Starlink to investors.
“We’re in this weird early part of the history of space-delivered communications where SpaceX is the only true provider at this scale,” said John Plumb, the former Pentagon space policy chief under President Joe Biden.
“And these repressive regimes think they can still turn off communications, but I think the day is coming where that’s just not possible,” he said.
Victoria Samson, chief director of space security and stability at the think tank Secure World Foundation, said Russia, which has deployed an array of technologies to counter Starlink in Ukraine, might be keen to examine the effectiveness of Iran’s Starlink interference.
“I think a lot of actors are watching how Starlink fares here,” she said.
Thousands of people protesting Iran’s clerical rule are reported to have been killed in the past week, while Tehran’s order to restrict communications makes it difficult to discern the full extent of its violent crackdown on dissent.
Starlink, which is harder for Iran to tamper with than cable and cellphone tower networks, has become crucial for documenting events on the ground, read the report.
Raha Bahreini, an Iran researcher at Amnesty International, said they had verified dozens of videos from Iran, including footage of protesters killed or injured by Iranian forces, and believe that almost all of them came from people who had access to Starlink. She added, however, that the ongoing communications restrictions have impeded human rights organizations’ communications with people in Iran in efforts to assess the scale of the violence.
Starlink is banned in Iran, yet tens of thousands of terminals may have been smuggled into the country, although it remains unclear how many are in use, according to Holistic Resilience, a U.S. nonprofit that has helped deliver Starlink terminals to Iranians and says it is working with SpaceX to monitor what it describes as Iranian attempts to jam the system.
Consumer Starlink terminals are rectangular antenna dishes that come in two sizes – one roughly the size of a pizza box and a smaller “mobile” one the size of a laptop.
SpaceX did not respond to requests for comment.
The Iranian mission to the United Nations in New York declined to comment on Thursday in response to Reuters’ questions.
Iranian Foreign Minister Abbas Araqchi, speaking to Al Jazeera TV on Monday, said the internet had been cut off “after we confronted terrorist operations and realized orders were coming from outside the country.”
Starlink, the first massive internet-from-space constellation of its kind, has emerged as a crucial tool for communications in wartime and remote areas. The network, which drove SpaceX’s $15 billion revenue in 2024, has expanded the geopolitical power of Musk, who in 2022 asserted control over how and where it was being used by Ukrainian troops fighting back Russian forces.
Roughly 10,000 low-orbiting Starlink satellites zipping above user terminals at an orbital velocity of some 17,000 miles per hour (27,360 kph) make its signals much harder to locate and disrupt than traditional satellite systems designed with a larger, single satellite fixed over a given territory.
Iran is likely using satellite jammers to disrupt the Starlink signals, according to Holistic Resilience and other specialists. Iran also appears to be engaging in so-called spoofing, or broadcasting fake GPS signals to confuse and disable Starlink terminals, according to Nariman Gharib, an Iranian opposition activist and independent cyber espionage investigator based in Britain, Reuters reported.
The GPS spoofing wreaks havoc on a Starlink terminal’s connection and slows internet speeds, said Gharib, who analyzed data from a terminal inside Iran.
“You might be able to send text messages, but forget about video calls,” he said.
Though Starlink is not licensed to operate in Iran, Musk has repeatedly confirmed its presence on his social media platform X, spurring a yearslong effort by the Iranian government to counter the service. Amid protests over the death of Mahsa Amini in December 2022, Musk posted that nearly 100 Starlink terminals were active in the country.
Following the 12-day war between Iran and Israel in June, Iran’s parliament passed a law banning the use of Starlink, introducing severe penalties for those who use or distribute the unlicensed technology, according to Iranian state media.
Iran has also pursued diplomatic channels, urging a panel at the United Nations’ International Telecommunication Union last year to force the United States and Norway — where Starlink is internationally registered — to block the service.
At a July meeting, Iran told the board that Starlink’s use in the country is illegal and said an “invading country” had deployed its terminals on drones during a recent attack.
Iran told the board in November that it was struggling to locate and disable the terminals itself.
-
Latest News4 days agoDeadly violence likely without dialogue between Afghanistan and Pakistan: ICG
-
Latest News3 days agoPakistan seeks Russian mediation to resolve Afghanistan tensions
-
International Sports4 days agoFIFA World Cup 2026: Play-Off Tournament takes centre stage
-
Sport4 days agoAfghanistan secures third place at 2026 World Kokpar Championship
-
Business4 days agoAfghani strengthens nearly 10% against US dollar amid banking sector reforms
-
Latest News3 days agoWorld must re-engage to prevent all-out Afghanistan-Pakistan war: Financial Times
-
Regional5 days agoTrump says US considering ‘winding down’ Iran war
-
Latest News5 days agoAfghanistan again ranked last in global happiness index
