The NASA-backed report reads: "Our comparative analyses support the blended hypotheses that terrestrial-type biology can survive within and contribute to the spectral signatures of Venus' clouds.
"To test the ideas presented here, we propose the need for an integrated chemical, biochemical, and microbiological study focusing on the survival and spectroscopy of terrestrial microorganisms under Venus' cloud conditions."
They add the planet – which is second from the Sun – should be investigated further in light of the findings.
It added: "Looking forward, investigations into the actual habitability of Venus' clouds would ideally benefit from a mixture of orbiter, lander, airplane/balloons, and sample return missions."
Sanjay Limaye of the University of Wisconsin-Madison's Space Science and Engineering Centre – said: "Venus shows some episodic dark, sulfuric rich patches, with contrasts up to 30-40 percent in the ultraviolet, and muted in longer wavelengths.
"These patches persist for days, changing their shape and contrasts continuously and appear to be scale dependent."
Venus has had plenty of time to evolve life on its own, she added.
"That's much longer than is believed to have occurred on Mars."
Last month research fellow Barry DiGregorio shocked the science world saying that he believes aliens have already been discovered on Mars.
Dr DiGregorio said snaps captured by NASA's Curiosity rover show what he believes are trace fossils – signs of past life.