The possibility of the existence of microbial life on Venus is not new. It dates back decades to the late 1960s. A 2004 study also concluded that chemical and physical conditions in the planet's lower cloud layers, could support microorganisms.
In the latest research, scientists point to the dark patches on Venus' clouds. They believe the clouds are made of sulfuric acid, iron, carbon dioxide and light-absorbing particles, like those found on Earth, and compared the dark spots to algae blooms in lakes, pointing to the size of the particles in the dark spots.
Researchers are urging more studies and have suggested gathering samples from Venus' clouds to find out for sure whether alien life truly exists there.