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What are solid-fuel missiles, and why is North Korea developing them?

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North Korea’s Hwasong-18 intercontinental ballistic missile (ICBM), launched for the second time on Wednesday, uses solid-fuel technology, giving it the capability to launch with little preparation.

Here are some characteristics of solid-fuel technology, and how it can help the North improve its missile systems.

WHAT IS SOLID-FUEL TECHNOLOGY?

Solid propellants are a mixture of fuel and oxidiser. Metallic powders such as aluminum often serve as the fuel, and ammonium perchlorate, which is the salt of perchloric acid and ammonia, is the most common oxidiser.

The fuel and oxidiser are bound together by a hard rubbery material and packed into a metal casing.

When solid propellant burns, oxygen from the ammonium perchlorate combines with aluminum to generate enormous amounts of energy and temperatures of more than 5,000 degrees Fahrenheit (2,760 degrees Celsius), creating thrust and lifting the missile from the launch pad.

WHO HAS THAT TECHNOLOGY?

Solid fuel dates back to fireworks developed by the Chinese centuries ago, but made dramatic progress in the mid-20th century, when the U.S. developed more powerful propellants.

North Korea uses solid fuel in a range of small, shorter-range ballistic missiles.

The Soviet Union fielded its first solid-fuel ICBM, the RT-2, in the early 1970s, followed by France’s development of its S3, also known as SSBS, a medium-range ballistic missile.

China started testing solid-fuel ICBMs in the late 1990s.

South Korea has also said it has secured “efficient and advanced” solid-propellant ballistic missile technology, though in much smaller rockets so far.

SOLID VS. LIQUID

Liquid propellants provide greater propulsive thrust and power, but require more complex technology and extra weight.

Solid fuel is dense and burns quite quickly, generating thrust over a short time. Solid fuel can remain in storage for an extended period without degrading or breaking down – a common issue with liquid fuel.

Vann Van Diepen, a former U.S. government weapons expert who now works with the 38 North project, said solid-fuel missiles are easier and safer to operate, and require less logistical support, making them harder to detect and more survivable than liquid-fuel weapons.

Ankit Panda, a senior fellow at the U.S.-based Carnegie Endowment for International Peace, said any country that operates large scale, missile-based nuclear forces would seek solid-propellant missiles, which do not need to be fuelled immediately ahead of launch.

“These capabilities are much more responsive in a time of crisis,” Panda said.

North Korea said the development of its new solid-fuel ICBM, the Hwasong-18, would “radically promote” its nuclear counterattack capability.

After the first launch South Korea’s defense ministry sought to downplay the testing, saying the North would need “extra time and effort” to master the technology. On Thursday, a ministry spokesperson said they were still analyzing the latest launch.

Source: Reuters

Science & Technology

Ethiopian volcano erupts for first time in nearly 12,000 years

Ash from the eruption drifted across the region, spreading over Yemen, Oman, India, and parts of Pakistan.

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The Hayli Gubbi volcano in Ethiopia’s Afar region has erupted for the first time in almost 12,000 years, sending massive ash plumes soaring up to 14 kilometres into the atmosphere, according to the Toulouse Volcanic Ash Advisory Centre.

The eruption began on Sunday and lasted several hours. Hayli Gubbi, located around 800 kilometres northeast of Addis Ababa near the Eritrean border, sits within the geologically active Rift Valley, where two major tectonic plates meet. The volcano rises roughly 500 metres above the surrounding landscape.

Ash from the eruption drifted across the region, spreading over Yemen, Oman, India, and parts of Pakistan. Satellite imagery and social-media videos captured a towering column of white smoke billowing into the sky.

The Smithsonian Institution’s Global Volcanism Program notes that Hayli Gubbi has no recorded eruptions during the Holocene, the period dating back about 12,000 years to the end of the last Ice Age.

Volcanologist Simon Carn of Michigan Technological University also confirmed on Bluesky that the volcano had “no record of Holocene eruptions.”

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Cloudflare outage easing after millions of internet users affected

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A global outage at web-infrastructure firm Cloudflare began to ease on Tuesday afternoon after preventing people from accessing major internet platforms, including X and ChatGPT.

Cloudflare, whose network handles around a fifth of web traffic, said it started to investigate the internal service degradation around 6:40 a.m. ET. It has deployed a fix but some customers might still be impacted as it recovers service.

The incident marked the latest hit to major online services. An outage of Amazon’s cloud service last month caused global turmoil as thousands of popular websites and apps, including Snapchat, were inaccessible due to the disruption.

Cloudflare – whose shares were down about 5% in premarket trading – runs one of the world’s largest networks that helps websites and apps load faster and stay online by protecting them from traffic surges and cyberattacks.

The latest outage prevented users from accessing platforms such as Canva, X, and ChatGPT, prompting users to log outage reports with Downdetector.

Downdetector tracks outages by collating status reports from a number of sources. “We saw a spike in unusual traffic to one of Cloudflare’s services beginning at 11:20 UTC. That caused some traffic passing through Cloudflare’s network to experience errors,” the company said in an emailed statement.

“We are all hands on deck to make sure all traffic is served without errors.”

X and ChatGPT-creator OpenAI did not immediately respond to requests for comment. – REUTERS

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China sends its youngest astronaut to ‘Heavenly Palace’ space station

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China’s Shenzhou-21 space rocket and its crew including the youngest member of its astronaut corps blasted off on Friday atop a Long March-2F rocket from the Jiuquan Satellite Launch Centre in northwest China, Chinese state media reported.

It was the seventh mission to the permanently inhabited Chinese space station since it was completed in 2022, Reuters reported.

Missions on China’s Shenzhou-21 spacecraft involve trios of astronauts on six-month stays in space, with veteran astronauts increasingly replaced by younger faces. First-timers Zhang Hongzhang, 39, and Wu Fei, 32 – China’s youngest astronaut to be sent to space – were picked to participate in the programme in 2020.

Commander Zhang Lu, 48, flew on the 2022 Shenzhou-15 mission.

FIRST SMALL MAMMALS ON SPACE STATION

The Shenzhou-21 astronauts will take over from the Shenzhou-20 crew who had lived and worked on board Tiangong, or “Heavenly Palace”, for more than six months. The Shenzhou-20 astronauts will return to Earth in the coming days.

The Shenzhou-21 crew were also joined by four black mice, the first small mammals to be taken to the Chinese space station. The mice will be used in experiments on reproduction in low Earth orbit.

Biannual launches have become the norm for the Shenzhou programme, which has in the past year reached new milestones with the deployment of Chinese astronauts born in the 1990s, a world-record spacewalk, and plans to train and send the first foreign astronaut, from Pakistan, to Tiangong next year.

The rapid advances have raised alarm bells in Washington, which is now racing to put a U.S. astronaut on the moon again before China does.

Both countries are also competing in nascent institution-building efforts, with the U.S.-led Artemis Accords on lunar exploration matched up against the Chinese and Russian-led International Lunar Research Station.

 

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