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A new study suggests that iguanas crossed over 5,000 miles from North America to Fiji around 34 million years ago by clinging to rafts of floating vegetation. The journey, considered the longest-known transoceanic migration by a terrestrial species, is believed to have occurred shortly after Fiji’s islands formed. Researchers speculate that extreme weather events, such as cyclones, could have uprooted trees and carried iguanas across the Pacific. The reptiles, which are the only iguanas found outside the Western Hemisphere, have long been a subject of debate regarding their origins.

Genetic Study Reveals Direct Link to North America

According to the study published in PNAS, researchers found that Fiji’s iguanas share a closer genetic link with species from North America than previously thought. Simon Scarpetta, Assistant Professor of Environmental Science at the University of San Francisco, stated in a press release that the evidence supports a direct journey from the West Coast of the United States to Fiji. This challenges earlier theories suggesting the reptiles may have arrived via Antarctica or Australia.

Reportedly, Jimmy McGuire, Professor of Biology at the University of California, Berkeley, said that alternative explanations for their migration did not fit within the geological timeline. It was noted that the iguanas likely reached Fiji soon after land became available in the region.

Adaptations May Have Helped Survival

More than 200 museum specimens were analysed for the research. The findings indicated that the Fijian iguanas, classified under the Brachylophus genus, are closely related to the Diposaurus genus, which includes desert iguanas found in North America. Scarpetta explained that these lizards are highly resistant to starvation and dehydration, which may have increased their chances of surviving the journey.

The estimated timeline of their migration aligns with the formation of Fiji’s islands. Researchers suggest that once land appeared, the iguanas established themselves, highlighting the remarkable nature of their journey.

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Crew-10 Astronauts Begin Return from ISS Aboard SpaceX Dragon

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August 7, 2025

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Crew-10 Astronauts Begin Return from ISS Aboard SpaceX Dragon

SpaceX’s Crew-10 mission coming to an end; 4 astronauts to return from International Space Station on Aug. 7, 2025 Almost five months into the mission, the crew — NASA’s Anne McClain (commander) and Nichole Ayers, JAXA’s Takuya Onishi, and Roscosmos’s Kirill Peskov — were flying over Mongolia when a workload scenario was suddenly imposed including an emergency descent. They are scheduled to board their Crew Dragon capsule, Endurance, on Thursday Aug. 7 and undock at 12:05 p.m. EST for their return home. The journey back is expected to take approximately 24 hours, with touchdown off the California coast coming Friday morning.

Undocking and Return Schedule

According to NASA, the SpaceX Crew Dragon capsule Endurance is set to undock from the ISS’s Harmony module at 12:05 p.m. EDT on Aug. 7, 2025. NASA will broadcast the departure live, beginning with hatch closure in the morning. After undocking, the capsule will re-enter Earth’s atmosphere on a mostly autonomous flight. It should splash down in the Pacific Ocean off California by about 11:58 a.m. EDT Friday.

The full trip home takes roughly 24 hours overall. NASA notes the schedule could shift if bad weather affects the landing zone. If all goes according to plan, a news conference will follow at 1:30 p.m. EDT on Friday.

Crew and Mission Summary

The Crew Dragon Endurance launched atop a Falcon 9 rocket on March 14, 2025 during SpaceX’s Crew-10 mission. Crew members at the ISS, the four-member team docked on March 16. The photo was taken in Kazakhstan, with US astronauts Anne McClain (crew commander) and Nichole Ayers (pilot); Japan’s Takuya Onishi; Russia’s Kirill Peskov.

They also spent almost five months working together on science experiments and station maintenance. The crew conducted a variety of experiments from cellular biology to new camera technologies during their mission. They had a small goodbye ceremony on the ISS on Aug. 5 They have been replaced by the Crew-11 team who came in on Aug. 2 to start a new tour of duty.

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Earth’s Oldest Impact Crater Turns Out to Be Much Younger Claims New Study

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August 6, 2025

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Earth’s Oldest Impact Crater Turns Out to Be Much Younger Claims New Study

A location in Western Australia that used to be named as the oldest meteorite impact crater on Earth is now actually a lot younger than that, scientists announced today in Science Advances. The structure — previously dated to 3.5 billion years ago and located within Western Australia’s North Pole Dome region of the Pilbara — was believed to be older than any of Earth’s known impact craters. Today, new research published in the journal Geochemistry found that what we now call the Miralga impact structure is, in fact, much younger, at 2.7 billion years old, and considerably smaller in diameter. This recasts earlier ideas on the early Earth’s geological activity and questions previous theories regarding impact-driven crust formation or perhaps even early life.

Miralga Crater Loses Oldest Impact Title but Gains New Scientific Relevance

As per The Conversation article republished by Space.com, the teams that explored the crater could only point to one thing that was likely — it had been formed by an impact. However, they ultimately disagreed as to whether this event had been and how large it was. Younger rocks contain shatter cones, indicating Earth’s early continental geology shielded the impact to a specific 2.7 billion-400 million-year period despite earlier assertions.

They made the determination to honour the cultural revision of one site from 100 km across to a more manageable 16 km wide crater named Miralga. It’s the site – still affected by seawater – of events too recent to influence the Earth’s crust.

The Miralga basalt feature (unique to basalt) is a rare site for an instrument to practice on before heading to Mars, while advancing our understanding of impacts and early life prospects.

Isotopic dating to clarify the crucial part played by this, the oldest crater on Earth and unique in a geological sense, in planetary science and early Earth history is presently ongoing at Miralga.

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NASA’s TRACERS Satellites Begin Solar Wind Study Despite SV1 Glitch

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19 hours ago

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August 6, 2025

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NASA's TRACERS Satellites Begin Solar Wind Study Despite SV1 Glitch

NASA’s TRACERS mission twin satellites were launched on July 23, 2025, to study how solar activity causes magnetic reconnection in Earth’s atmosphere. After launch, a power subsystem anomaly had affected one of the satellites (Space Vehicle 1, SV1) on July 25, causing periodic communication loss. NASA said satellite 2 (Space Vehicle 2, SV2) is “healthy,” and transition is beginning to the instrument commissioning phase. The idea behind TRACERS was to develop a complete toolkit that would allow us, for the first time, to observe all of these complex solar wind connection processes at once. NASA engineers are actively working to recover SV1. Single vector views (SV2) spacecraft are completing a healthy checkout and readying themselves for their science mission.

Recovery Efforts for SV1 Satellite

According to NASA, controllers detected a problem with SV1’s power subsystem in late July that led to intermittent contacts and a loss of communication. Data suggest SV1 can only remain active when its solar panels receive sufficient sunlight. Because of the spacecraft’s current orientation, engineers plan to wait until later in August — when SV1’s panels will receive more sun — to reestablish contact and continue recovery steps.

Meanwhile, mission teams are reviewing onboard data to diagnose the issue and plan next steps. Any time contact is regained, the team will assess SV1’s status and check for impacts on the mission’s science goals. For now, no significant updates on SV1 are expected for several weeks.

SV2 Operational Status

The mission’s other satellite, SV2, is in good health and fully operational. Mission teams have been testing SV2’s onboard instruments and systems through a standard commissioning process. This checkout is proceeding as expected, with NASA anticipating that commissioning will finish by the end of August.

Once SV2 is fully checked out, it will begin coordinated science operations with its twin to study magnetic reconnection – the process that shapes how solar activity affects Earth’s magnetic environment. For now, SV2 continues its planned tests and will soon be ready to collect valuable science data as part of the TRACERS mission.

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