A DISTANT moon in our solar system might mirror Earth’s seasons, according to scientists, who also believe it could be a candidate for finding nearby alien life.
And just spotted a mysterious motion in its atmosphere.
, Saturn’s largest moon, is home to sprawling rivers and lakes of liquid methane, icy boulders and dunes of grains that resemble coffee grounds.
It even has an ocean hiding beneath its surface.
Some 746million miles (1.2billion kilometers)away from , the distant moon is thought to have rain clouds just like Earth.
Unlike seasons on Earth, Titan has a much longer seasonal cycle, with each year on the moon lasting nearly three decades on our planet.
Despite its brutally cold temperatures, which average around -179C (-290F), this strange, world appears to have the organicingredients for life.
Titan is the only moon in our solar system with a significant atmosphere, making it a top candidate for exploration.
Nasa’s $3.35billion (£2.48billion) is set to explore the possibility of past or present water-based life, particularly in subsurface oceans and liquid reservoirs.
The mission just passed its critical design review – meaning engineers can begin building the helicopter-like robot ahead of its scheduled launch in July 2028.
Dragonfly, which was officially selected as a viable mission in 2019, is expected to reach Titan sometime in 2034.
‘Strange’ motion
In late May, researchers found that Titan’s hazy atmosphere wobbles like a gyroscope in line with its seasons, as opposed to spinning in line with its surface.
The “strange”; motion was detected following analysis of archival infrared data gathered by Cassini probe.
“The behavior of Titan’s atmospheric tilt is very strange,”; Dr. Lucy Wright, a postdoctoral researcher at the University of Bristol, said at the time.
“Titan’s atmosphere appears to be acting like a gyroscope, stabilising itself in space.
“We think some event in the past may have knocked the atmosphere off its spin axis, causing it to wobble.
“Even more intriguingly, we’ve found that the size of this tilt changes with Titan’s seasons.”;
But understanding how the atmosphere wobbles with the seasons is crucial for calculating the landing trajectory of Dragonfly.
The will be carried by Titan’s fast-moving winds as it descends through the atmosphere.
Winds on Titan’s upper atmosphere can be tempestuous, with speeds reachingup to 270mph (430kmph).
Near the surface, however, the winds are much weaker.
The tilt of the planet affects how Dragonfly’s payload – a suite of scientific instruments designed to search for alien life – will be carried through the air.
So research into the atmospheric motion can help engineers better predict where Dragonfly will touch down on the lunar surface.
Food for thought
There appears to be plenty of organic material on Titan to support alien lifeforms, according to a study published in The Planetary Science Journal last month.
Its lakes and its subsurface ocean believed to be 300miles deep, is thought to be filled with cold, oily methane and ethane – which is organic material.
“There has been this sense that because Titan has such abundant organics, there is no shortage of food sources that could sustain life,”; Antonin Affholder, of the University of Arizona and lead author of the paper, said in a statement.
The world exceeds even Earth’s oil reserves.
However, scientists remain skeptical, and while Titan could harbour life, it’s likely only to be a small amount.
“We point out that not all of these organic molecules may constitute food sources, the ocean is really big,”; added Affholder.
“And there’s limited exchange between the ocean and the surface, where all those organics are, so we argue for a more nuanced approach.”;
