Scientists are embarking on a groundbreaking mission to unlock the mysteries of the early universe by harnessing the dark side of the moon. This ambitious project, led by Prof Eloy de Lera Acedo from the University of Cambridge's Cavendish Laboratory, aims to deploy a suitcase-sized satellite, dubbed CosmoCube, into lunar orbit. CosmoCube'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.
The 21cm line serves as a cosmic thermometer, allowing scientists to measure the physical temperature of gas during the early universe. By observing the redshift of this signal, researchers can trace the evolution of the universe 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).
One of the key advantages of this mission is the moon's far side, which remains shielded from human-generated radio interference that plagues Earth-based observations. CosmoCube's observations from this vantage point will provide a clearer picture of the early universe, free from terrestrial noise.
However, the path to success is not without challenges. Previous attempts to detect the 21cm line have been hampered by weak signals and interference from FM radios, plane communication, and the Earth's ionosphere. Despite these obstacles, the team behind CosmoCube is optimistic, with an estimated total cost of £50 million and a launch date five years from now.
The mission has already secured over £2 million in funding from the UK Space Agency. Phil Bull, a professor of cosmology at the Jodrell Bank Centre for Astrophysics, praised the endeavor, emphasizing its potential to reveal the fundamental ingredients of our cosmic origins. However, he also noted the competitive nature of the field, with other missions vying for similar measurements.
The race to understand the early universe is on, and CosmoCube's journey to the dark side of the moon may just be the key to unlocking some of the cosmos' most profound secrets.
