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Researchers unlock secrets of Earth’s wickedly hot innermost realm


In Jules Verne’s classic 1864 novel “Journey to the Center of the Earth,” adventurers descend through an Icelandic volcano into a vast underground world populated by prehistoric creatures as they explore our planet’s interior. The actual center of the Earth is nothing like this fanciful depiction – and in some ways is even more dramatic.

Researchers on Tuesday said an intensive study of Earth’s deep interior, based on the behavior of seismic waves from large earthquakes, confirmed the existence of a distinct structure inside our planet’s inner core – a wickedly hot innermost solid ball of iron and nickel about 800 miles (1,350 km) wide.

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Earth’s diameter is about 7,900 miles (12,750 km). The planet’s internal structure comprises four layers: a rocky crust on the outside, then a rocky mantle, an outer core made of magma and a solid inner core. This metallic inner core, about 1,500 miles (2,440) wide, was discovered in the 1930s, also based on seismic waves traveling through Earth.

Scientists in 2002 proposed that lurking within this inner core was an innermost section separate from the rest, akin to a Russian Matryoshka nesting doll. The increasing sophistication of seismic monitoring enabled this to be confirmed.

Earthquakes unleash seismic waves that travel through the planet and can reveal the contours of its interior structure based on the changing shape of the waves.

Until now, scientists were able to detect these waves bouncing up to twice, from one side of Earth to the other and then back. The new research studied waves from 200 quakes with magnitudes above 6.0 ricocheting like ping pong balls up to five times within the planet.

“We may know more about the surface of other distant celestial bodies than the deep interior of our planet,” said observational seismologist Thanh-Son Pham of the Australian National University in Canberra, lead author of the study published in the journal Nature Communications.

“We analyzed digital records of ground motion, known as seismograms, from large earthquakes in the last decade. Our study becomes possible thanks to the unprecedented expansion of the global seismic networks, particularly the dense networks in the contiguous US, the Alaskan peninsula and over the European Alps,” Pham added.

The inner core’s outer shell and its newly confirmed innermost sphere both are hot enough to be molten but are a solid iron-nickel alloy because the incredible pressure at the center of the Earth renders it a solid state.

“I like to think about the inner core as a planet within the planet. Indeed, it is a solid ball, approximately the size of Pluto and a bit smaller than the moon,” said Australian National University geophysicist and study co-author Hrvoje Tkalcic.

“If we were somehow able to dismantle the Earth by removing its mantle and the liquid outer core, the inner core would appear shining like a star. Its temperature is estimated to be about 5,500-6,000 degrees (Celsius/9,930-10,830 Fahrenheit), similar to the sun’s surface temperature,” Tkalcic said.

The transition from the outer part of the inner core to the innermost sphere appears to be gradual rather than a sharp boundary, Pham said. The researchers were able to differentiate the two regions because the seismic waves acted differently between them.

“It could be caused by different arrangements of iron atoms at high temperatures and pressures or the preferred alignment of growing crystals,” Pham said.

The inner core is slowly growing in size at the expense of the outer core by solidifying molten materials as Earth gradually cools – as it has done since its birth about 4.5 billion years ago.

“The latent heat released from solidifying the Earth’s inner core drives the convection in the liquid outer core, generating Earth’s geomagnetic field,” Pham said. “Life on Earth is protected from harmful cosmic rays and would not be possible without such a magnetic field.”

Read more:

Asteroid to come ‘extraordinarily close’ to Earth, poses no danger: NASA

NASA’s James Webb Telescope reveals molecular, chemical origins of distant planet

Video: Massive chasm appears in Earth’s crust caused by disastrous Turkey earthquake

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Saudi Fund for Development Celebrates 50 Years of Global Impact with Over $20 Billion in Development Contributions

The Saudi Fund for Development (SFD) celebrated its 50th anniversary in Riyadh today, under
the theme “50 Years of Global Impact.”The event brought together key development partners to
reflect on the SFD’s significant contributions to sustainable development worldwide. Over the
past five decades, the SFD has allocated over $20 billion, financing more than 800 development
projects and programs in vital sectors, including social infrastructure (education, healthcare,
water and sewage, and housing and urban development), communication and transportation
(roads, railways, airports and seaports), energy, agriculture, mining and industry, and others.
Since its inception in 1974, the SFD has been the international development arm of the Kingdom
of Saudi Arabia and has provided critical support to over 100 developing nations around the
world. With a strong focus on supporting countries to achieve the Sustainable Development
Goals (SDGs), the SFD has played a pivotal role in driving sustainable development in Least
Developed Countries (LDCs) and Small Island Developing States (SIDS).
During the event, SFD Chairman H.E. Ahmed Al-Khateeb emphasized the importance of
collaboration in driving global development. He highlighted that SFD’s success is deeply rooted
in its partnerships, with 27 development projects and programs in 23 developing countries in
2023 co-financed with other funders. He also underscored the need to forge new partnerships and
strengthen existing ones to create a world where every individual has the opportunity to reach
their full potential.
Reflecting on this significant milestone, the SFD CEO , Mr. Sultan bin Abdulrahman Al-
Marshad, stated: “As we celebrate five decades of impactful work, we are committed, now more
than ever, to supporting developing countries on their journey to economic self-reliance and
resilience. Our goal is to ensure that all children can go to school, that education is not a
privilege but something every child should have access to, and that families have access to
healthcare and basic vital services. Equally, we focus on critical infrastructure development, like
building roads and enhancing airports and sea ports, so that countries can thrive and engage in
economic activities and trade. This work is not just about financing; it’s about tangibly
improving lives, creating opportunities, empowering communities, and building a more
prosperous future.”
On the sidelines of the 50 th Anniversary Gala, the SFD and the Asian Development Bank (ADB)
signed a new $25 million agreement to co-finance a renewable energy development project in the
Solomon Islands. This marks the first project for SFD in the Solomon Islands. The primary aim

of the project is to develop renewable energy infrastructure, reduce dependency on fossil fuels,
and promote sustainable development in the region.
This agreement builds on SFD’50 years of transformative impact through development projects
that have spanned Africa, Asia and the Pacific, Latin America and the Caribbean, and Eastern
Europe.
This includes key projects such as the Metolong Dam in Lesotho, which received $25 million in
funding and now provides potable water to 280,000 people, enhancing water security and public
hygiene and health in the region. This is just one of the 433 projects across Africa, with a total
funding of $11.5 billion, which focuses on critical areas such as infrastructure and water security.
In Asia, the SFD has funded 271 projects with a total funding of $7.8 billion. One notable
example is the SFD’s contribution to the Mohmand Dam Hydropower Project in Pakistan, which
has an overall project cost of $240 million. The projects contributes to the country’s energy
security and flood resilience by generating 800 megawatts of renewable energy and storing 1.6
million cubic meters of water.
In Latin America and the Caribbean, the SFD has financed 21 projects, totaling $951 million
USD. This includes rehabilitating the Water and Sewage System in Havana, Cuba, where the
SFD has allocated $35 million to enhance public infrastructure. Another significant initiative is
the rebuilding of St. Jude Hospital in Saint Lucia, supported by $75 million funding, which will
contribute to providing high-quality health services to citizens in a modern and sophisticated
facility and providing sufficient medical supplies and equipment to support the effective
operation of the hospital.
In Eastern Europe, the SFD has contributed to 14 projects with a total investment of $303
million. A key initiative is the construction of the Tirana-Elbasan-Chokos-Chalf-Ploce Road,
where the SFD provided $73.8 million to rebuild essential roads and bridges, thereby boosting
regional economic activities.
During the celebration, esteemed speakers shared insights on the SFD’s pivotal role in global
development, and in championing critical partnerships and collective action and response.
Keynote speakers included:

 HRH Prince Turki bin Faisal Al Saud, Founder and Trustee of the King Faisal
Foundation
 H.E. Ahmed bin Aqeel Al-Khateeb, Chairman of the Board of Directors of the SFD
 H.E. Akinwumi Adesina, President of the African Development Bank Group
 H.E. Muhammad Al Jasser, Chairman of the Islamic Development Bank

These global development leaders emphasized the SFD’s commitment to fostering sustainable
growth in countries and communities with the most pressing developmental needs. The gala was attended by more than 500 people, including ministers, heads of regional and international organizations, ambassadors, representatives of the United and other distinguished
guests. As the SFD looks to the future, it reaffirms its mission and pledge to drive international
development efforts, on behalf of the Kingdom of Saudi Arabia, and to contribute to global
stability, social progress, and economic prosperity for future generations.

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Jordan warns of escalation in southern Lebanon

Jordan warned on Sunday of the increasing escalation in southern Lebanon and a potential regional war in light of the ongoing Israeli aggression in Gaza, Jordan News Agency (Petra) reported.

Foreign Ministry spokesperson Sufian Qudah discussed supporting Lebanon, its security, stability and the safety of its people and institutions, noting the need to adhere to Security Council Resolution 1701 to reduce and prevent further escalation and protect the region from the risk of slipping into a regional war.

Qudah added that the Israeli war on Gaza and the failure to reach an exchange agreement that leads to an immediate and permanent ceasefire puts the entire region at risk of the conflict expanding.

He discussed launching an effective international movement that imposes an immediate cessation of the aggression on Gaza.

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China issues guidelines for coordinated digital, green transformation

China’s Office of the Central Cyberspace Affairs Commission and nine central departments have issued new guidelines for the coordinated transformation toward digital development and green growth, Xinhua News Agency reported.

Published on Saturday, the guidelines focus on two main areas: promoting the green, low-carbon development of digital industries and accelerating the green transformation of various sectors through digital technology.

They aim to accelerate the coordinated transformation toward digital development and green growth, promote the integration of emerging technologies with green, low-carbon industries, and enhance traditional industries using digital and green technologies.

Outlining fundamental principles, the guidelines specify the roles of authorities, industry associations, universities, research institutes and businesses in driving this transition.

They provide a three-part framework covering the basic capacity, technological systems and industrial systems for digital-green integration.

Regions are encouraged to focus on high-quality development, develop new quality productive forces, leverage local resources and create specialized industries and functional advantages to accelerate coordinated digital and green development.

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