Earlier this week scientists were left baffled by a huge feature that surfaced in the seas of Titan that measured a staggering 100 square miles (260sq km) - the size of Washington DC or the city of Birmingham in the UK. And in the latest speculation a number of theories have been considered including a giant iceberg and a huge field of bubbles. Speaking to MailOnline, two scientists explained their thoughts on what it might have been and that they hope to learn more upon repeated observations early next year. In this series of images from the Cassini spacecraft the giant object 100 square miles (260 square kilometres) in size is seen rising out of one of Titan's largest seas before disappearing again. In the latest image on the right the object still seems to be partially submerged beneath the surface
@highlight
Two scientists have told MailOnline that they think the giant object on Saturn's moon Titan could have been an iceberg
@highlight
Astronomers at Nasa in California were left baffled by its appearance
@highlight
It's possible the giant feature emerged from under the sea as Titan's Northern Hemisphere moves from spring to summer and heats up
@highlight
This may have dislodged the potential iceberg from the seabed
@highlight
However one expert says this would not be a threat to future boats planned to explore the seas of Titan
@highlight
The massive object appeared in one of Titan's largest seas in July 2013 before disappearing beneath the surface again in August 2014
@highlight
It could also be a field of rising bubbles from vents or undersea volcanoes
@highlight
Monitoring changes like this is one of the key goals of Nasa's Cassini spacecraft that is currently in orbit in the Saturnian system
It has been a decade since Cassini entered orbit around @placeholder (illustration shown).