![]() ![]() But, when it decays, this radioactive isotope of Aluminum leaves behind Magnesium-26, a stable non-radioactive isotope of Magnesium. The half-life of Aluminum-26 is around 717,000 years, meaning it is too short-lived to be directly found in large quantities in the 4.6-million-year-old space rock. (Image credit: Wikimedia Commons/Steve Jurvetson) Meteorite dating made easy Two end-cut faces of the Erg Chech 002 meteorite. "Because it decays over time, we can use it to date events - particularly within the first four or five million years of the solar system's life." "Aluminum-26 is very useful stuff for scientists who want to understand how the solar system formed and developed," Krestianinov told Live Science. To determine the age of Erg Chech 002 as 4.566 billion years old, the team measured the amounts of lead isotopes within it, but this, ironically, could have provided scientists with a way of improving another dating strategy for similar meteorites. Additionally, because Aluminum-26 decays to Magnesium-26, a stable form of Magnesium, it can be used as a dating system for space rocks. Understanding how Aluminum-26 was distributed as the planets were forming around 4.6 billion years ago is thus important to building a picture of how the rocky inner planets of the solar system evolved. So, for Earth, an example of this differentiation would be the formation of a dense metal core and, above it, a less dense rocky mantle. This is because the melting allows denser material to sink to the core of planets. In the wake of the hearing, a bipartisan group of House members called on Speaker Kevin McCarthy to form a select committee tasked with investigating the federal response to UAPs.Planetary melting is believed to be the process by which rocky planets like ours "differentiated" or formed different compositions at different layers. Interest from Congress in UAPs has grown in recent years, but it reached a flashpoint in July when the House Oversight Committee held a hearing featuring testimony from a former military intelligence officer and two former fighter pilots, who had first-hand experience with the mysterious objects. Records in the collection would have the "presumption of immediate disclosure," which means a review board must provide reasoning for the documents to remain classified. Mike Rounds, a South Dakota Republican, introduced an amendment to the Senate's version of the defense bill that would mandate the National Archives and Records Administration to create the "UAP Records Collection," which would house information from federal agencies related to the issue. Senate Majority Leader Chuck Schumer, a New York Democrat, and Sen. This year, lawmakers from both parties are seeking to use the defense legislation, known as the National Defense Authorization Act, as the vehicle for making the federal government release more information about the objects. The AARO was established through the annual defense policy bill approved by Congress in 2021 and is considered the leading federal agency for UAP efforts. ![]() Kirkpatrick told a NASA study group in May that the office "has found no credible evidence thus far of extraterrestrial activity, off-world technology, or objects that defy the known laws of physics." ![]() Navy and Air Force aviators and operators. Many of the object sightings were reported by U.S. As of the end of August 2022, there have been more than 500 UAP sightings over the last 17 years, according to a January report from the intelligence community. UAPs are considered objects detected in the air, sea and space that can't be identified. The information posted to the site is what has been declassified "to date," Ryder said. The site will also be updated in the future to allow service members, federal employees or contractors "with direct knowledge" of government programs or activities related to UAP to submit reports for review by the AARO, according to the Pentagon. Ryder said the website will provide information including photos and videos on resolved UAP cases as they're declassified and allowed for public consumption. Patrick Ryder, the Pentagon press secretary, said at a news briefing. The site aims to serve as a "one-stop shop" for publicly available information related to the All-Domain Anomaly Resolution Office, known as AARO, and UAPs, the formal government name for the seemingly inexplicable objects previously known as UFOs, Air Force Brig. Washington - The Defense Department announced Thursday that its office tasked with overseeing efforts to address unidentified anomalous phenomena, or UAPs, launched a new website to provide the public with declassified information about the mysterious objects. ![]()
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