Ancient Ocean on Mars: Rover Finds Signs of Water
China's Zhurong rover has uncovered exciting clues showing that a vast, icy ocean once lapped against Martian shores billions of years ago.
Imagine standing on the Red Planet, wearing a warm spacesuit, looking out over a giant sandy beach. Millions of kilometres away from Earth, scientists have discovered exciting signs that an ancient ocean on Mars really did exist billions of years ago! On 7 November 2024, a team of space researchers shared amazing news based on data collected by China’s Zhurong robotic rover.
The rover, which landed on Mars in May 2021 as part of the Tianwen-1 mission, has been exploring a huge basin called Utopia Planitia. Led by Professor Bo Wu from The Hong Kong Polytechnic University and Dong Jie from the China Academy of Space Technology, the scientists pieced together clues showing that waves and ice once shaped the dry Martian ground.
What happened?
Mars is known today as a freezing, rust-coloured desert. However, scientists combined scans from the Zhurong rover with observations from spacecraft circling above, including China’s Tianwen-1 and NASA’s Mars Reconnaissance Orbiter. When they looked closely at the rover’s path, they spotted remarkable coastal shapes carved into the Martian ground.
The team noticed strange crater-like features called pitted cones. On Earth, similar mounds form as mud volcanoes, bubbling up where underground water or ice is pushed up under intense pressure. The rover also drove past layered sediments, criss-crossing polygonal troughs, and water flow channels that were etched into the ground by moving liquid long ago.
By carefully studying the height and slope of the landscape, researchers identified three distinct zones. These matched up with an ancient nearshore shoreline, a shallow sea, and a much deeper offshore seabed. According to the scientists, a gigantic flood of water rushed into the area about 3.68 billion years ago to create this enormous northern ocean. Over time, the surface of the sea froze into a thick sheet of ice before slowly drying up and vanishing completely around 3.4 billion years ago.
Why does it matter to you?
Whenever you look up at the night sky from your balcony or school terrace in India, Mars looks like a tiny, dry red dot. Learning that it once had shorelines changes the way we see our neighbouring planet. It shows us that planets can change completely over billions of years, just like Earth has changed!
Finding ancient coastlines also helps scientists know where to search for signs of past microbial life. For young Indian explorers dreaming of working at ISRO or building space rovers one day, this discovery shows there are still countless mysteries waiting to be solved. Perhaps one of you will help design the next robotic explorer that drills into Martian sands to uncover ancient sea fossils!
Words to know
- Basin: a large, low bowl-shaped dip in the surface of a land or planet.
- Sediments: tiny pieces of sand, soil, and rock that settle at the bottom of water over time.
- Mud volcano: a mound created when water, mud, and gases bubble up from underground under pressure.
- Microbial life: living things that are so tiny, such as bacteria, that you need a microscope to see them.
Did you know?
The northern lowlands of Mars where the ocean once sat cover a huge part of the planet, showing that ancient Mars was once a cold, watery world rather than just a dusty desert!
Think about it
If you were choosing a landing spot for a future space mission, would you want to explore an ancient ocean beach or a giant volcano? What kind of experiments would you ask the rover to perform?
Quick quiz
Which robotic rover collected the ground data that revealed ancient Martian coastlines?
- Curiosity
- Zhurong
- Perseverance
See the answer
Zhurong
Sources
This story was prepared by the Kids Gazette news desk with the help of AI research and writing tools, using the sources listed above.
