Australia's vast Nullarbor Plain hides deep caves that can teach us about alien worlds
Stretching more than 200,000 square kilometers (77,000 square miles) across southern Australia, the vast, flat plains of the Nullarbor mark one of the world's largest regions of limestone. It formed when an ancient shallow sea retreated some 14 million years ago.
The Nullarbor Plain in southern Australia, stretching over 200,000 square kilometers, is a vast region of limestone formed from a retreating ancient sea millions of years ago. Despite its seemingly simple appearance, the plain harbors a complex underground world of caves created by water dissolving the limestone over millions of years.
Shallow, linear trenches on the plain, which appear almost invisible from the ground, actually mark the surface expression of deeply buried cave systems. These shallow trenches, up to 20 kilometers long and a few meters wide, align with known cave systems and sinkholes, suggesting that they are merely muted surface manifestations of these vast underground networks.
Understanding these cave systems is crucial for various reasons, including engineering works, geological hazard mitigation, and accessing groundwater resources. Moreover, caves serve as significant scientific archives, preserving ancient environments and ecosystems that would otherwise be lost. They may also host unique life forms adapted to isolated conditions, offering insights into potential life forms on other planets.
The study's findings could aid in identifying cave systems on other planets, including Mars, by using the Nullarbor's dry, stable surface as an analog.
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