Thursday, September 29, 2022

China will send satellite to make Earth’s moon shield

Moon

month. Photo: Christopher Lehenff via Getty Images

Astronomers in China plan to use the Moon as a “shield” to probe cosmic “dark ages” without interference from radio signals from human activity on Earth. The Dark Ages lasted about 200 million years after the Big Bang and has not yet been touched by humans.

informed of south china morning postDiscovering the Sky on the Longest Wavelength (DSL) mission, also known as Hongmeng in Chinese mythology, to capture the ultra-long radio waves emitted by hydrogen atoms before the birth of the first stars and to illuminate the universe Will send 10 satellites to the moon. , This ancient radio signal holds a million secrets about the beginning of the creation of the universe, but it is difficult to collect because it is blocked by radio interference from Earth.

Of the 10 satellites, nine will act as “child” satellites that orbit the far side of the Moon, while the parent satellite is in charge of transmitting information to Earth. These satellites are designed to be able to counteract the radio signals emitted by human activities. A team of astronomers who are members of the DSL mission understand his plan in the magazine Philosophical Transactions of the Royal Society A 2020 edition.

Chen Xueli, a professor at the National Astronomical Observatory at the Chinese Academy of Sciences involved in the project, said the mission could provide “the first glimpse into an age of cosmic darkness”, as well as “the potential for great discoveries” in other areas. Radio signals from exoplanets, or other galaxies, as in research on the Sun, planets and planets.

“It is time that we consider undertaking a space mission that explores and solves the mysteries surrounding this band of waves,” reads the study proposing DSL. “As the first rover mission, the main goals of DSL were (1) to open a new observation window by mapping the sky and listing the major sources at these wavelengths, uncovering new astrophysical phenomena at these wavelengths, and discovering the unknown. To discover; (2) trace the cosmic dark ages by making high-precision global spectrum measurements.”

The DSL mission began feasibility testing in 2015, and is still waiting for the green light from China’s space program. If approved, Chen and his fellow researchers will prepare for a mid-2020 launch for the mission. They need only one rocket to send 10 satellites to the moon.

Chen’s team concluded, “Radio signals with ultra-long wavelengths have the potential to make major scientific breakthroughs, particularly in studying the cosmic dark ages and early periods of star formation in the universe.” “Lunar orbital systems like DSL could kickstart their efforts over the next decade.”

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