Scientists are embarking on an ambitious mission to unlock the secrets of the early universe, and they're doing it by harnessing the dark side of the moon. This innovative project, led by Prof Eloy de Lera Acedo from the University of Cambridge's Cavendish Laboratory, aims to place a suitcase-sized satellite, aptly named CosmoCube, into lunar orbit. The satellite's primary objective is to detect a radio frequency signal emitted by neutral hydrogen atoms in the early universe, specifically targeting the elusive 21cm line.
What makes this mission so intriguing is the satellite's ability to track the physical temperature of gas during the early universe. By observing the 21cm signal, which acts as a thermometer, scientists can study events from the 'dark ages' (approximately 380,000 years after the Big Bang) through the cosmic dawn and the epoch of reionization (around 1 billion years after the Big Bang). This journey through time will provide valuable insights into the universe's evolution.
One of the key advantages of this approach is the satellite's vantage point on the far side of the moon. By avoiding the interference caused by Earth-based instruments and human-made technology, CosmoCube can collect data that is free from terrestrial disturbances. This is a significant improvement over previous attempts to detect the 21cm line, which have been hindered by Earth's ionosphere and human-generated radio noise.
The mission's potential is immense, but it's not without its challenges. The total cost is estimated at just under £50 million, and the project is expected to take around five years to launch. Despite the financial investment, the UK Space Agency has already granted over £2 million in funding, recognizing the mission's scientific importance. However, the race is on, as other lunar missions might introduce the very radio noise CosmoCube aims to detect, making it a race against time.
The implications of this mission are profound. By studying the 21cm signal, scientists can gain a deeper understanding of the universe's major ingredients, including the processes that led to the formation of the first stars and galaxies. This knowledge will shed light on the cosmic origins and the very beginnings of our universe. As the mission unfolds, it will undoubtedly spark curiosity and excitement among scientists and the public alike, offering a glimpse into the mysteries of the cosmos.
