Mapping Mars: The Geology of the Red Planet
View the high resolution version of this incredible map by clicking here
For centuries, Mars has been mythically defined by its characteristic red appearance.
In Babylonian astronomy, Mars was named after Nergal, the deity of fire, war, and destruction. In Chinese and Japanese texts, the planet was known as 火星, the fire star.
Although this unique reddish hue has been a key defining characteristic of Mars in culture for centuries, today we now know that it’s the iron oxide soil of the Martian landscape that makes it the “Red Planet” – and that there is much more to Mars than its color upon closer observation.
Above, today’s map, posted and created by Reddit user /hellofromthemoon, brings together the data from centuries of observation and the numerous missions to the Red Planet to map out its geology on a grand scale.
A Red Dot in the Sky
Egyptian astronomers first observed the planet Mars four thousand years ago and named it “Horus-the-red.” Babylonian astronomers marked its course through the night sky to track the passage of time. But it was not until 1610, when Galileo Galilei witnessed Mars with his own eyes through a telescope, that Mars was revealed as a whole other world.
Over the centuries with improving technology, a succession of astronomers observed and crudely mapped out everything from polar ice caps to yellow clouds, and white and dark spots denoting varying elevations across the Martian surface. Some of the earliest maps of Mars date to 1831. But there is only so much you can accurately observe from the surface of the Earth.
On July 14, 1965, NASA successfully received the first up-close images of Mars from the Mariner 4 spacecraft, passing within 9,844 kilometers (6,117 miles) of Mars’ surface. Mariner 4 captured the image of a large ancient crater and confirmed the existence of a thin atmosphere composed largely of carbon dioxide.
Since then, four space agencies have successfully made it to Mars: NASA, the former Soviet Union space program, the European Space Agency and the Indian Space Research Organization. From orbital satellites to surface exploration with robots, each successful mission has brought back important data to develop an evolving picture of the planet.
Here is a complete list of both the successful and failed missions to Mars.
On Mars, we see volcanoes, canyons, and impact basins much like the ones on Earth. The yellows scattered across the map indicate meteor impacts of varying size while the swaths of red indicate volcanoes and their associated lava flows. The varying colors of brown indicate the cratered highlands and midlands that make up most of the southern hemisphere.
The planet appears asymmetric. Most of the southern hemisphere is heavily cratered and resembles the moon’s highlands. In contrast, the northern hemisphere is sparsely cratered and has many large volcanoes.
Mars is approximately one-half the diameter of the Earth, but both planets have the same amount of dry land. This is because the current surface of Mars has no liquid water.
Mars and Earth are very different planets when it comes to temperature, size, and atmosphere, but geologic processes on the two planets are eerily similar. The sheer size of some landforms on Mars would shadow over similar features on Earth because of the lack of water erosion. This lack of erosion has preserved billion year-old geologic features.
The tallest mountain on Mars and in the solar system is Olympus Mons, and it is two and a half times taller than Mt. Everest. A Martian canyon system, called Valles Marineris, is the length of the entire continental United States and three times deeper than the Grand Canyon.
Mars Colony: Location, Location, Location
The first step to building a colony is to figure out where the best chance of survival is. For Mars, some researchers have identified the planet’s poles, which contain millennia-old ice deposits. These are thought to contain large amounts of ice, which mars settlers could extract and turn into liquid water.
The poles also host other natural resources, such as carbon dioxide, iron, aluminum, silicon and sulfur, which could be used to make glass, brick and plastic. Furthermore, the planet’s atmosphere contains enough hydrogen and methanol for fuel.
Closing the Distance
The map above represents the culmination of centuries of work which we are lucky enough to view here on a computer, conveniently online for us to appreciate and wonder what life’s like on the surface of Mars.
Who knows what more exploration will reveal.
How Much Student Debt Does Each State Hold?
Crippling student debt in the U.S. has reached a record high of $1.5 trillion nationwide. Today’s map breaks down which states bear the highest burden.
How Much Student Debt Does Each State Hold?
Education may be priceless, but the costs of obtaining it are becoming steeper by the day.
Almost half of all university-educated Americans rely on loans to pay for their higher education, with very few graduating debt-free. Total U.S. student debt has more than doubled in the last decade—reaching a record high of $1.5 trillion today.
Today’s data visualization from HowMuch.net breaks down the average student debt per capita, to uncover which states shoulder the highest burden in this growing crisis.
Students are Paying Through the Nose
Before diving into the graphic, let’s take a quick look at why student debt is racking up. The ballooning costs to attend college today compared to thirty years ago is one driving factor.
Source: The College Board 2018 report.
What’s more, these figures don’t include the expenses for accommodation and other supplies, which can add another $15,000-$17,000 per year.
The United States of Student Debt
In the state map above, it’s immediately obvious that Washington D.C. tops the list. While the nation’s capital is the most educated metropolitan area in the country, it also suffers from $13,320 in student debt per capita.
At approximately 147% above than the national average of $5,390, Washington D.C.’s debt burden per capita is almost double that of the state in second place. Georgia comes in with $7,250 debt per capita, 34.5% above the national average.
|State||Student Debt per Capita||Difference from Average|
|District Of Columbia||$13,320||147.1%|
Rounding out the five states with the most student debt per capita are Maryland, Minnesota, and Ohio, in that order. On the flip side, Wyoming has the least debt per capita ($3,610), which is 33.0% lower than the national average. Hawaii follows right behind at $3,780, and 29.9% below the national average.
Interestingly, a growing population on the West Coast helps to lower the debt burden for states like California, even despite the strong presence of prestigious schools. Home to Stanford, USC, UCLA, CalTech, and more, the Golden State surprisingly only has $4,530 in debt per capita.
The Last Straw?
Today’s Americans are more educated than ever before, but the sticker shock is causing some whiplash. This overall trend of spiraling student debt has significant implications on a person’s life trajectory. With many graduates unable to repay their loans on time, more of them are delaying major life milestones, such as starting a family or becoming a homeowner.
In efforts to curb this crisis, many 2020 presidential hopefuls have already started proposing plans to cancel or forgive student debt—with close attention on mid- to low-income households that would benefit the most from reduced loans.
The History of the World, in One Video
This epic attempt to condense the history of the world — including the rise and fall of empires — fits into a single video.
Throughout the history of the world, many civilizations have risen and fallen.
You may be familiar with the achievements of prominent societies like the Romans, Mongols, or Babylonians, but how do all of their stories intertwine over time and geography?
Visualizing the History of the World
Today’s video comes to us from Ollie Bye, and it attempts to integrate the histories of all major civilizations known by historians into a single, epic video.
Similar to the Histomap, it’s pretty much impossible for a video like this to be perfect due to biases and a general lack of data. However, it’s still a compelling attempt at showing global history in a short and sweet fashion.
Let’s look at some specific moments on the video that particularly stand out.
750 AD: The Umayyad Caliphate
One of the largest empires in history, the Umayyad Caliphate peaked sometime around 750 AD.
Conquering most of North Africa, the Middle East, and even parts of Europe (including modern-day Spain, Portugal, and France), the Umayyads commanded a formidable territory with an area of 11,100,000 km² (4,300,000 sq. mi) and encompassing 33 million people.
1279: Mongol Dominance
No history of the world is complete without a mention of the Mongols.
Nearby societies have always been on edge when nomadic tribes in the Eurasian Steppe entered into organized confederations. Similar to the Huns or various Turk federations, the Mongols were known for their proficiency with horses, bows, and tactics like the feigned retreat.
Under the leadership of Temüjin — also known as Genghis Khan — the Mongols conquered one of the largest empires by land.
The empire reached its greatest extent just two years after the death of Genghis Khan.
Later on, it fragmented into smaller empires that were also quite notable in the context of world history. For example, Kublai Khan — the grandson of Genghis Khan — even went on to begin the influential Yuan Dynasty in China.
1346: The Black Death
The video also shows other vital stats, such as an estimate of global population through the ages.
In the mid-14th century, you can see this number take a rare U-turn, as millions of people die from the infamous and deadly Bubonic Plague.
The Black Death — one of the most devastating pandemics in the history of the world — hit Europe in 1346, and it eventually killed 30-60% of the continent’s population. There is no exact figure on the final death toll, but historians estimate it to be somewhere between 75 and 200 million people throughout Eurasia.
1418: The Age of Discovery
The video also provides a 10,000-foot view of the Age of Discovery, a period of time in which European powers explored the world’s oceans.
This colonial period marks the beginning of globalization, creating wide-ranging impacts that set the stage for more modern history.
In the video, it’s possible to see European colonies develop in all parts of the world, as well as how they eventually morphed into the countries that dot the globe today.
Playing the History Game
While it is certainly ambitious, not everyone will agree that this is a successful attempt at portraying world history – even in the limited scope of time allotted.
One key detail that seems to be missing, for example, is showing the development of the indigenous societies that existed in North America for thousands of years. That said, it’s also not clear what data and records are available to show these maps over many centuries of time.
Despite the possible flaws, the video does pack a lot of information into a short period of time, creating a compelling opportunity for learning and discussion. Like the Histomap, it may not be a definitive history of the world – but instead, it’s a useful attempt that stimulates our appetite for more information about the world and the societies that inhabit it.
Markets7 months ago
The Jeff Bezos Empire in One Giant Chart
Maps9 months ago
Mercator Misconceptions: Clever Map Shows the True Size of Countries
Advertising6 months ago
Meet Generation Z: The Newest Member to the Workforce
Misc9 months ago
24 Cognitive Biases That Are Warping Your Perception of Reality
Advertising5 months ago
How the Tech Giants Make Their Billions
Technology8 months ago
The 20 Internet Giants That Rule the Web
Chart of the Week7 months ago
Chart: The World’s Largest 10 Economies in 2030
Environment6 months ago
The World’s 25 Largest Lakes, Side by Side