The Topography of Mars: Visualizing an Alien Landscape
The surface of the Red Planet is full of surprises.
While the Grand Canyon and Mount Everest are both impressive features on Earth, they are nothing next to Valles Marineris and Olympus Mons, their epic Martian counterparts.
Even more extraordinary, the overall difference between the highest and lowest point on Mars is 19 miles (31 km), whereas just 12 miles (20 km) separates the summit of Mount Everest from the bottom of the Mariana Trench on Earth.
This week’s map comes to us from Reddit user /hellofromthemoon, who carefully laid out the terrain of Mars in awesome detail.
Take a look…
Lay of the Land
Mars can be divided into two major regions, separated by a ridge of mountains roughly around the planet’s middle.
On the north side are lowlands that have been shaped by lava flows, creating a surface dominated by large plains. Meanwhile, the southern hemisphere is mountainous, with many meteorite impact craters, some of which stretch for hundreds of kilometers.
The Plains Game
The plains of Mars fall into two categories: the planitia (Latin for “plains”) and the maria (Latin for “seas”). The latter type is named after the sea because these regions appeared to be under water in the eyes of early astronomers. But actually, the surfaces of these regions are covered with many rocks, making them look darker to the eye.
The second type of plains are the planitia, and they account for vast areas covered by sand rich in iron oxide. The strong winds that blow the sand and dust around can change the configuration of the plains, forming new patterns on the surface of Mars. However, the planet’s features remain relatively unchanged over time.
One of the largest plains is the Utopia Planitia (Latin for “Nowhere Land Plain”) impact basin. This giant impact crater lies within a larger lava plain. With an estimated diameter of 3,300 km, Utopia Planitia is the largest recognized impact basin in the solar system.
As Above, so Below
The northern and southern hemispheres are vastly different from one another on Mars, and such a stark difference is unlike any other planet in the solar system. Patterns of internal magma flow could have caused the variation, but some scientists think it is the result of Mars taking one or several major impacts.
About 4.5 billion years ago, Mars formed from the collection of rocks that circle the sun before they formed the planets. Over time, the red planet’s molten masses differentiated into a core, a mantle, and an outer crust.
Understanding how the red planet’s topography changes over time is a crucial step in grasping how the planet formed. That is why NASA launched the InSight Mars lander on May 5, 2019. This probe will listen for vibrations deep within the Martian crust to further understand the composition of the planet.
Understanding the topography of Mars is critical for any mission to the planet, including the selection of a site for a potential colony. There are three basic criteria for picking a manned mission landing site:
- A spot that is sustainable in terms of water, energy generation, and building materials.
- A spot that is scientifically interesting for a long mission.
- A spot that is safe to land.
Brian Hynek, a planetary scientist and Director of the Center for Astrobiology at the University of Colorado at Boulder, offers five potential landing sites:
- Outer edge of Mars’ North polar ice cap
- Deep canyon of Valles Marineris
- Martian “glaciers” in the Hellas Basin near Mars’ mid-latitudes
- Arabia Terra
- Martian lava tubes and caves
With growing information from every new mission to Mars, a greater picture will help guide future human activity and ambitions on the planet.
The 44 Closest Stars and How They Compare to our Sun
This graphic visualizes the 44 closest stars, revealing key facts such as distance from Earth, brightness, and whether potential planets are in orbit.
44 Closest Stars and How They Compare to our Sun
Humans have been fascinated by the stars in the night sky since the dawn of time.
We’ve been decoding the mysteries of celestial bodies for many centuries, but it is only in the last 200 years or so that we’ve been able to glean more detailed information on the lights that dot the night sky. Friedrich Bessel’s method of stellar parallax was a breakthrough in accurately measuring the positions of stars, and opened new doors in the effort to map our universe. Today, high-powered telescopes offer even more granular data on our cosmic neighborhood.
The infographic above, from Alan’s Factory Outlet, categorizes the 44 closest stars to Earth, examining the size, luminosity, constellations, systems, and potential planets of each star.
Our Nearest Stellar Neighbors
Our closest neighboring stars are all part of the same solar system: Alpha Centauri. This triple star system – consisting of Proxima Centauri, Alpha Centauri A, and Alpha Centauri B – attracts a lot of interest because it hosts planets, including one that may be similar to Earth.
The planet, Proxima Centauri b, is a lot closer to its star than Earth is to the Sun. However, because Proxima Centauri is a smaller and cooler red dwarf type star, the planet’s orbit is within the habitable zone. It’s thought that Proxima Centauri b receives approximately the same amount of solar energy as Earth does from our Sun.
Here’s a full list of the 44 of the closest stars to Earth:
|Star Name||Distance (light years)||MoE|
|α Centauri A||4.37||±0.0068|
|α Centauri B||4.37||±0.0068|
|Luyten 726-8 A||8.79||±0.012|
|Luyten 726-8 B||8.79||±0.012|
|EZ Aquarii A||11.11||±0.034|
|61 Cygni A||11.40||±0.0012|
|61 Cygni B||11.40||±0.0012|
|Struve 2398 A||11.49||±0.0012|
|Struve 2398 B||11.49||±0.0012|
|Groombridge 34 A||11.62||±0.0008|
|Groombridge 34 B||11.62||±0.0008|
|Kruger 60 A||13.07||±0.0052|
|Kruger 60 B||13.07||±0.0052|
|Wolf 424 A||14.05||±0.26|
|Van Maanen's star||14.07||±0.0023|
Even though we see many of these stars in the night sky, humans aren’t likely to see them in person any time soon. To put these vast distances into perspective, if the Voyager spacecraft were to travel to Proxima Centauri, it would take over 73,000 years to finally arrive.
The Brightest Stars in the Sky
The closest stars aren’t necessarily the ones most visible to us here on Earth. Here are the top 10 stars in terms of visual brightness from Earth:
|Rank||Proper name||Constellation||Visual magnitude (mV)||Distance (light years)|
|4||Rigil Kentaurus & Toliman||Centaurus||−0.27 (0.01 + 1.33)||4.4|
Excluding our Sun, the brightest star visible from Earth is Sirius, or the Dog Star. Sirius, which is about 25 times more luminous than the sun, visually punctuates the constellation Canis Major.
Filling in the Gaps
The next step in learning more about our surroundings in the cosmos will be seeing which of the stars listed above have planets orbiting them. So far, the 44 stars in the infographic have over 40 planets scattered among them, though new discoveries are made all the time.
With each new mission and discovery, we learn a little bit more about our pocket of the universe.
Visualizing the True Size of Land Masses from Largest to Smallest
Maps can distort the size and shape of countries. This visualization puts the true size of land masses together from biggest to smallest.
The True Size of Land Masses from Largest to Smallest
Is Greenland the size of the entire African continent?
But looking at a map based on the Mercator projection, you would think so.
Today’s infographic comes from the design studio Art.Lebedev and shows the true size of the world’s land masses in order from largest to smallest using data from NASA and Google.
Check out the actual shape and size of each land mass without any distortions.
Distorting Reality: Mercator Misconceptions
Maps can deceive your eyes but they are still powerful tools for specific purposes. In 1569, the legendary cartographer, Gerardus Mercator, created a new map based on a cylindrical projection of sections of the Earth. These types of maps were suited for nautical navigation since every line on the sphere is a constant course, or loxodrome.
Despite the map’s nautical utility, the Mercator projection has an unwanted downside. The map type increases the sizes of land masses close to the poles (such as in North America, Europe, or North Asia) as a side effect. As a result, Canada and Russia appear to take up approximately 25% of the Earth’s surface, when in reality these nations only occupy 5%.
“Things are not always what they seem; the first appearance deceives many.” – Phaedrus
This collection of images above represents the world’s land masses in their correct proportions. Measurements are based on Google Maps 2016 and NASA Earth Observatory maps, with calculations based on the WGS84 reference ellipsoid, or more simply, a specific model of the Earth’s shape in two dimensions.
We take for granted Google Maps and satellite imaging. Making these accurate representations is no small task – the designers went through six steps and many different iterations of the graphic.
Countries are arranged by descending size and shown without external or dependent territories. For example, the total area for the contiguous United States shown does not include Hawaii, Alaska, or overseas territories.
Top 10 Largest Land Masses
Although Mercator maps distort the size of land masses in the Northern Hemisphere, many of these countries still cover massive territories.
|United States (contiguous)||7,654,643|
The top 10 land masses by size account for 55% of the Earth’s total land. The remainder is split by the world’s 195 or so other countries.
Top 10 Smallest Land Masses
Here are the 10 tiniest jurisdictions highlighted on the map:
While the Earth’s land surface has been claimed by many authorities, the actual impact of human activity is less than one would think.
Human Impact: Humbled by Nature
Political borders have claimed virtually every piece of land available. Despite this, only 20% of land on the planet has been visibly impacted by human activity, and only 15% of Earth’s land surface is formally under protection.
The remaining 80% of the land hosts natural ecosystems that help to purify air and water, recycle nutrients, enhance soil fertility, pollinate plants, and break down waste products. The value of maintaining these services to the human economy is worth trillions of U.S. dollars each year.
While some nations are not as big as they look on the map, every piece of land counts.
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