A top scientist has sensationally named four planets he considers most likely to host alien life.
Experts recently sparked a frenzy after discovery potential signs of life on Venus in a major space surprise.
NASA is even considering space missions to the planet in the wake of the Earth-shattering find.
But Gareth Dorrian, a post doctoral research fellow in space science at University of Birmingham, has named four more planets he believes are "most promising" in the hunt.
He named Mars, Europa, Enceladus and Titan as the four most worth visiting.
Mars has traditionally been known as a planet that could host life, with Daily Star Online speaking to one scientist convinced extraterrestrial life has already been found on the Red Planet.
And Mr Dorrian explains how it is "one of the most Earth-like worlds in the solar system".
He told The Conversation: "Today, Mars has a very thin, dry atmosphere comprised almost entirely of carbon dioxide.
"This offers scant protection from solar and cosmic radiation. If Mars has managed to retain some reserves of water beneath its surface, it is not impossible that life may still exist."
On Europa, he added: "At the bottom of this ocean world it is conceivable that we might find hydrothermal vents and ocean floor volcanoes. On Earth, such features often support very rich and diverse ecosystems."
For Enceladus, he continued: "Not only was water detected in these geysers but also an array of organic molecules and, crucially, tiny grains of rocky silicate particles that can only be present if the sub-surface ocean water was in physical contact with the rocky ocean floor at a temperature of at least 90˚C.
"This is very strong evidence for the existence of hydrothermal vents on the ocean floor, providing the chemistry needed for life and localised sources of energy."
Meanwhile for Titan, he explained how its freezing temperatures of -180C make it too cold for liquid water.
But, he added it has been considered a potential spot for life due to the "bountiful chemicals" it hosts.
Such alien creatures would have "fundamentally different chemistry to terrestrial organisms", he added.
UFO investigator Nick Pope, who once investigated UFOs for the Military of Defence, told the Daily Star Online that if aliens are found on Venus it would be "the most important scientific discovery in history".
He said: "This could be the biggest and most important scientific discovery in history.
"The implications are profound, because if lose arose not once but twice in our solar system, it suggests life isn't a cosmic accident or miracle, but something that happens naturally and frequently.
"This bombshell discovery suggests the universe is teeming with life. It's estimated there are 100 billion stars in our galaxy and 100 billion galaxies in the universe – and those are the lowball figures – so who knows what might be out there?"