Alien life may be hiding much closer to home than science fiction would have us believe, according to a particle physicist and dark matter researcher Dr Sarah Alam Malik, who argues that Saturn's moons Titan and Enceladus, and Jupiter's moon Europa, could host the right conditions for life in our own solar system.
Her assessment is based on a cascade of discoveries from NASA's Cassini mission to Saturn, which ended in 2017, and subsequent studies of so‑called 'ocean worlds' that appear, at first glance, to be frozen and dead.
The scientific hunt for alien life has long been dominated by the idea of a 'Goldilocks zone,' a narrow band around a star where temperatures are just right for liquid water on a planet's surface.
That framework shifted attention towards Earth‑like planets orbiting distant suns, rather than the icy moons orbiting our gas giants. Cassini's 13‑year tour of Saturn forced a rethink.
Data from the mission, Alam Malik notes, showed not only that liquid water can exist far from the Sun, locked beneath ice, but that moons themselves can be dynamic, chemically rich environments that arguably look more promising than some rocky exoplanets we celebrate in headlines.
When Voyager 1 skimmed past Saturn's moon Titan in 1980, it saw little more than a thick orange haze. Instruments detected an atmosphere mostly made of nitrogen, laced with methane and ethane, intriguingly similar in composition to Earth's own air. It was enough to earn Titan a place on the 'we must go back' list.
Cassini's return, more than two decades later, carried a stowaway built for that task. The Huygens probe detached from the main spacecraft, drifted alone through space for about three weeks, then dropped through Titan's murky skies on a parachute for two and a half hours.
Buffeted by winds of around 400 kilometres per hour, it somehow survived the landing and kept transmitting for several hours, becoming the first probe to touch down on a moon in the outer solar system.
What it saw was quietly astonishing. Titan's surface resembled a bleak Earth in sepia: a flat, sandy plain under dim orange light, scattered with rounded pebbles. The images and data showed clear signs of erosion. Gullies, drainage channels and river‑like features had been carved by flowing liquid over long timescales.
At roughly 180 °C, that liquid is not water. Follow‑up fly‑bys, more than 100 of them, allowed Cassini to use radar to peer through the haze. It mapped vast lakes and seas at Titan's north pole, filled with liquid methane and ethane.
Source: International Business Times UK
