SMILE satellite represents milestone in China-Europe space cooperation

Researchers from China and Europe have achieved a landmark collaboration in space science as the Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) was successfully launched Tuesday aboard a Vega-C rocket from Europe's Spaceport in French Guiana.

The satellite, a joint mission between the Chinese Academy of Sciences (CAS) and the European Space Agency (ESA), is aimed at studying space weather and its effects on Earth. It will use soft X-ray imaging technology to provide a global view of the large-scale structure of Earth's magnetosphere for the first time.

Following its launch, the satellite was confirmed to have entered its planned orbit, with its solar arrays successfully deployed and systems operating normally.

"The SMILE satellite is the first to conduct panoramic imaging of Earth's magnetosphere. The satellite is in a highly elliptical orbit, with one orbit taking approximately 50 hours, during which more than 40 hours are spent photographing and observing at apogee," Said Dai Lei, chief designer of SMILE's science application system at the National Space Science Center of CAS.

"The primary scientific objective is to perform global imaging of the large-scale structures in Earth's space environment using soft X-ray and ultraviolet bands, revealing the processes and evolutionary patterns of solar wind-magnetosphere interaction," said Li Huawang, chief designer of SMILE at the Innovation Academy for Microsatellites of CAS (IAMCAS).

SMILE was first proposed in 2015, marking the first mission-level deep collaboration between CAS and ESA.

Scientists have installed four scientific payloads on the SMILE satellite. ESA is in charge of the payload module, while the platform module is under the responsibility of CAS.

To reach higher orbit, the engineers had to reduce the weight of the structure part. They updated their designs and structures to make the best use of the material and function of the satellite.

"From system concepts to engineering reality, I evolved with this project," said Liu Bang, deputy attitude control designer of SMILE at IAMCAS.

The mission is expected to deliver a series of scientific breakthroughs in areas including space weather forecasting and the fundamental understanding of magnetospheric physics.

SMILE satellite represents milestone in China-Europe space cooperation

The U.S. Department of War announced on Tuesday that it has reduced the total number of Brigade Combat Teams (BCTs) assigned to Europe from four to three, returning to the levels seen in 2021.

This decision was the result of a comprehensive, multi-layered process focused on U.S. force posture in Europe, and it results in a temporary delay in the deployment of U.S. forces to Poland, the statement said.

Speaking at a White House press briefing the same day, Vice President J.D. Vance pushed back against media reports that the government had canceled a plan this month to send more than 4,000 troops to Poland, referring to the move as "just a standard delay in rotation" that is aimed at encouraging Europe to "take more ownership over its own territorial integrity."

In a May 2 interview, President Trump said the United States intends to "cut way down" its troop numbers in Germany, describing reductions that would go "a lot further" than the 5,000 personnel the Pentagon had announced a day earlier. Critics argued that the withdrawals are meant to punish NATO allies that did not join the U.S. military operations against Iran.

U.S. Department of War reduces Brigade Combat Teams in Europe