![]() Ultimately, the idea we know more about the moon than the deep sea is at best about 70 years out of date. And yet this self-deprecating line is repeated by scientists themselves, who may find that highlighting the deficit of knowledge about the deep sea helps to promote the need for ocean research. But some deep-sea scientists argue that the persistent estrangement of the deep sea minimizes the vast amount of research about it that has emerged in recent decades.ĭeep-sea biology is relentlessly referred to as a discipline that knows less about its own field of study than a relatively small, barren rock devoid of atmosphere, water and life. A useful analogyīecause the deep sea is so physically inaccessible, comparing it to space may offer a useful analogy for an otherwise difficult-to-imagine ecosystem. We don't think much about the deep sea unless we're watching a documentary or horror film, or perhaps reading about some "horrific alien-like monster" dredged up by a deep-sea trawler. It intrudes on our lives in a tangible way that the deep sea does not. It feels like we know more about the moon than the deep sea, because we are forced to accept its presence. We can see the moon wax and wane and we can experience the push and pull of the tides. By being able to see it, we accept an apparently glowing rock hanging in the sky more easily than that parts of the ocean are very deep. Both are dark, scary and far away.īut we can see the moon very easily by simply looking up. It feels natural to compare the deep sea to space. The bathyscaphe Trieste was the first crewed vessel to reach Challenger Deep, in 1960. So why do people keep saying we know more about the moon or Mars than the deep sea? On the other hand, only 12 people have "set foot" on the moon and 24 people have visited it. Nevertheless, at least 27 and as many as 40 or more people have visited the Challenger Deep as of early 2023. ![]() "The deepest place on Earth" could refer to the Mariana Trench, or just the deepest part of it (the Challenger Deep, named for the British survey ship HMS Challenger). This statement is difficult to substantiate. A surprising number of visitorsĪnother related and incorrect comparison is that more people have set foot on the moon than have visited the deepest place on Earth. The deep ocean must be considered in three dimensions-and, unlike the moon, it is a diverse and dynamic ecosystem. What's more, high-resolution maps do not constitute the total sum of knowledge. This may be why the comparison has shifted to Mars, which has a surface area of 145 million square kilometers. This amounts to about 120 million square kilometers, or about three times the moon's total surface area. Credit: GEBCOĪlmost a quarter of the world's sea floor ( 23.4%, to be precise) has been mapped to a high resolution. The earliest written record is in a 1954 article in the Journal of Navigation, in which oceanographer and chemist George Deacon refers to a claim by geophysicist Edward Bullard.Ī 1957 paper published in the Journal of the Royal Society of Arts states: "the deep oceans cover over two-thirds of the surface of the world, and yet more is known about the shape of the surface of the moon than is known about that of the bottom of the ocean." This refers specifically to the scant amount of data available on the topography of the sea floor and predates both the first crewed descent to the deepest part of the ocean, the Mariana Trench (1960), and the first moon landing (1969).Īlmost a quarter of the world’s seafloor has been mapped in detail. So where does this curious idea come from? Mapping the deep More recently, in Blue Planet II (2017) and other sources, the moon is replaced with Mars.Īs deep-sea scientists, we investigated this supposed "fact" and found it has no scientific basis. This idea has been repeated for decades by scientists and science communicators, including Sir David Attenborough in the 2001 documentary series The Blue Planet.
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