Recently, scientists have identified the circumstances under which an atmosphere can form on Uranus' moons. RBC-Ukraine explains what is worth knowing about the planet Uranus, its moons ...
The early atmosphere was mainly carbon dioxide and water vapour. Water vapour condensed to form the oceans. Photosynthesis caused the amount of carbon dioxide to decrease and oxygen to increase.
Carbon dioxide (CO2) has been present in the atmosphere since the Earth condensed from a ball of hot gases following its formation from the explosion of a huge star about five billion years ago.