Astronomers have recently discovered that the amount of hydrogen sulfide in the atmosphere of Uranus is very high. It is a compound that smells like rotten eggs. By the way, the smell of any other body in space was known only once, when Apollo astronauts said that the moon dust smells like burnt gunpowder.
The atmosphere is very thin, so there will not be any special smell there. Like Uranus, a good amount of hydrogen sulfide is also found on Venus and Mars.
The smell on Jupiter will depend on where you are in the atmosphere. Some areas have a high amount of ammonia, which smells like cleaning fluid, while some have a high amount of hydrogen sulfide (eggs) and some have a high amount of hydrogen cyanide (bitter almonds).
Saturn and Neptune will hardly have any smell because they are mainly made up of odorless gases hydrogen and helium.
Earth: Earth’s atmosphere is composed mostly of nitrogen and oxygen, with small amounts of other gases. This mixture has no odor, but the various smells from plants, flowers, and oceans give Earth a unique and fragrant scent.
Mars: Mars’ atmosphere is much thinner than Earth’s and consists mainly of carbon dioxide. Scientists predict it may smell like desert soil on Earth.
Venus: Venus’ atmosphere is very dense and consists mainly of carbon dioxide and sulfuric acid. Scientists predict the smell will be extremely pungent and unpleasant, similar to burnt hair or rotten eggs.
