Researchers are developing a mission to place a small satellite in lunar orbit to investigate the early universe by detecting a specific radio frequency signal emitted by neutral hydrogen atoms. The satellite, designated CosmoCube, will search for what scientists call the 21cm line, a signal that becomes stretched to longer wavelengths over cosmic time in a process known as redshift.
The 21cm line acts as a thermometer for measuring gas temperature in the early universe, allowing researchers to study a period spanning from approximately 380,000 years after the big bang through the emergence of the first stars and galaxies, extending to roughly 1 billion years after the big bang. Scientists believe the signal’s characteristics will also provide insights into dark matter, the mysterious substance that comprises a significant portion of the universe. According to Prof Eloy de Lera Acedo of the University of Cambridge’s Cavendish Laboratory, the physical temperature of gas in the early universe and the conditions affecting it during that era can be determined through analysis of this signal.
Detecting the 21cm line from Earth presents substantial difficulties. The signal itself is weak, and it faces interference from various human-made sources including radio and aircraft communication systems. Additionally, disturbances from the Earth’s ionosphere complicate observations. Although researchers at the Edges radio telescope in Australia have claimed to detect the 21cm line, their results have drawn scrutiny. Positioning the detector on the far side of the moon would substantially reduce many of these environmental obstacles.
The CosmoCube mission is projected to operate for two years and carry an estimated cost of just under £50 million, with launch anticipated approximately five years from the current date. The UK Space Agency has already allocated more than £2 million in funding to the project. External experts have expressed support for the initiative, though they note that multiple teams are pursuing similar observations and competing to achieve results first. One concern raised is that future lunar missions may introduce radio interference that could undermine the advantages of conducting observations from the moon’s far side.
Article Attribution | Read More at Article Source
Article summary produced by Claude AI