Scientists say it likely originated from
the first luminous objects to form in the universe, which includes both the first stars and black holes.
Numerical simulations of collapsing clouds of primordial gas indicate that
the first luminous objects to form in the universe were isolated massive stars.
It is possible to probe the Epoch of Reionisation and trace the history of the formation of
the first luminous objects by sensitive measurements of the spectral signature of neutral hydrogen.
The Webb observatory, which is the work of thousands of scientists and engineers across the globe, will be carefully tested to ensure it is ready to launch and enable scientists to seek
the first luminous objects in the universe and search for signs of habitable planets.»