National Geographic Society Newsroom

Pictures: Places on Earth Aliens Could Thrive?

Getting involved in astronomy doesn’t always require a telescope. In fact, there’s a whole class of space researchers who get more mileage out of microscopes: They’re called astrobiologists. According to NASA, astrobiology is: “the study of the origin, evolution, distribution, and future of life in the universe. This multidisciplinary field encompasses the search for habitable...

Getting involved in astronomy doesn’t always require a telescope. In fact, there’s a whole class of space researchers who get more mileage out of microscopes: They’re called astrobiologists.

According to NASA, astrobiology is:

“the study of the origin, evolution, distribution, and future of life in the universe. This multidisciplinary field encompasses the search for habitable environments in our Solar System and habitable planets outside our Solar System, the search for evidence of prebiotic chemistry and life on Mars and other bodies in our Solar System, laboratory and field research into the origins and early evolution of life on Earth, and studies of the potential for life to adapt to challenges on Earth and in space.”

That means many an astrobiologist gets to spend time visiting some of the most beautiful places on Earth, searching for extremely odd bacteria, ancient fossils, and other signs of life that may offer clues to what aliens could be like and how life might have evolved on other planets.

Recently, NASA released a collection of pictures dubbed From Earth to the Solar System (FETTSS), which showcases planetary exploration, including the sites around the globe that serve as “crucibles of discovery” for astrobiology.

The full FETTSS collection of more than 90 images is meant to be shared via physical exhibits, a layout inspired by the 2009 International Year of Astronomy project From Earth to the Universe (FETTU). Interested parties can submit an application for permission to access high-resolution versions to make poster-size displays.

Huge prints of pictures from the FETTU collection appeared, for example, at a Chinese science museum, inside an Arizona airport, on the outsides of Slovenian buses, and on Portuguese public restrooms.

Recently FETTSS organizers and the contributing photographers granted permission for us to share some of their works online.

Browsing through the gallery above, you’ll see stunning shots of these gorgeous places here on our own planet that are aiding our understanding of what life may be like across the solar system:

Shark Bay, Australia
For about 85 percent of the history of life on Earth, only microbes existed. The only large-scale evidence of their activities is preserved by stromatolites, ancient structural records of life on Earth that hold evidence both of the biology of the microbial mat communities that created them and the nature of the environments in which they grew. They are rocky, dome-shaped structures formed in shallow water through the trapping of sedimentary grains by communities of microorganisms. When too much material becomes trapped in the mats and limits the amount of sunlight that can filter through, the organisms migrate up and form a new community on top of the old. Stromatolites are mostly found in lakes and marine lagoons where extreme conditions such as high saline levels prevent animals from grazing. One such location is the Hamelin Pool Marine Nature Reserve in Shark Bay, Western Australia, a UNESCO World Heritage site, where living specimens are preserved today.

Yellowstone National Park
What is causing the beautiful colors in this hot spring in Yellowstone National Park? Life, that’s what! Many microorganisms live in the pools there, and because the temperatures of the springs are so hot (most are well over 100 degrees F, or 37.7 degrees C), they are called extremophiles (extreme-loving). They contain molecules that absorb the damaging rays of the sun, protecting their DNA. Those same molecules are also pigments that cause the different colors we see. Different extremophiles thrive in different temperatures, so the color of a particular area is determined by which organisms are living in it. A veritable rainbow appears as the water temperature decreases as it flows further and further away from its superheated source. For more info, check out “Science of the Springs,” a full-color guidebook to Yellowstone’s astrobiology sites.

Mono Lake, California
Calcium carbonate formations called tufa give California’s Mono Lake an otherworldly feel. Mountains surround the lake, forming a closed hydrological basin—water flows in, but it doesn’t flow out. Because the only way for water to leave Mono Lake is through evaporation, it is naturally hypersaline—roughly two to three times saltier than the ocean. Freshwater streams and underwater springs have brought trace amounts of minerals into the lake over the eons, including arsenic. Recently, bacteria which appear to incorporate arsenic rather than phosphorus into their basic biological molecules were found living in Mono Lake. This fascinating discovery may require us to rewrite our biology textbooks and broadens the possibilities of how life elsewhere in the universe, if it exists, might utilize the resources in its environment.

High Lakes, South America
The highest volcanic lakes in the world are located in the Andes Mountains of South America. Their elevation and isolation make them some of the least understood lakes on Earth and excellent analogs for lakes that existed on Mars 3.5 billion years ago. Simba Lake, at an elevation of 19,265 feet (5,872 meters) in the Chilean Andes, is red because of algae that developed pigments to protect themselves against high UV radiation. They float in the water near the surface, not deep enough to use the water column as a natural protection. Astrobiologists working there study the impact of rapid climate change on lake habitat and life’s adaptability in an effort to understand the evolution of the early environments of both Mars and Earth.

Pilbara, Western Australia
Created in a shallow pool on early Earth more than three billion years ago, these stromatolites represent a record of the most ancient life on Earth. They formed because colonies of microbes, as they grew, incorporated sediments from the water to create rocky structures. Found in Western Australia, the stromatolites take several different forms, including the slightly cone-shaped ones seen here resembling an egg carton. The structures shown in this picture are each about half an inch (1.2 centimeters) high. Astrobiologists study these enigmatic structures to gain a deeper understanding of the early environments in which life on Earth originated and evolved.

Rio Tinto, Spain
Cloudy with particulates and flowing along terraces made of iron oxides, the Rio Tinto in southwestern Spain stretches for more than 62 miles (100 kilometers) before reaching the Atlantic. Despite its acidic waters and high concentrations of iron and other heavy metals, the river supports an incredible diversity of extremophile microorganisms, including algae and fungi. Microbial biofilms colonize the riverbed and are covered with yellow iron oxide precipitates, seen here. Because of geological similarities with Mars, the Mars Astrobiology Research and Technology Experiment (MARTE) team tested equipment at Rio Tinto in 2005 for drilling on Mars in search of subsurface life. The drilling was accomplished entirely by remote control, and the team concluded that it’s feasible for a similar procedure to be successful on Mars.

Svalbard, Norway
Svalbard is a remote archipelago in northern Norway, deep within the Arctic Circle. Scientists with the Arctic Mars Analog Svalbard Expedition (AMASE) traveled there to test the protocols, procedures, and equipment needed to detect traces of organic chemistry and perhaps life on Mars. Instruments that will fly onboard NASA’s Mars Science Laboratory and ESA’s ExoMars missions were tested in Svalbard by the AMASE team. With a unique combination of volcanoes, hot springs, and permafrost, the Bockfjord Volcanic Complex on Svalbard is the only place on Earth with carbonate deposits identical to those found in the famous Martian meteorite ALH84001 (aka Allan Hills). What a unique opportunity to study the interaction between water, rocks, and primitive life forms in a Mars-like environment!

Flinders Range, South Australia
A piece of upturned sandstone in the Flinders Range of South Australia shows ripple marks of an ancient sea bed. This area of Australia hosts fossils of the first complex, multicellular organisms, which began to emerge on Earth about 600 million years ago. The study of these early fossils, known as the Ediacaran Fauna, help astrobiologists learn more about how complex life arose and evolved on Earth, and how it might evolve on other planets.

Ellesmere Island, Canada
Borup Fiord Pass Glacier on Ellesmere Island in Nunavut is a site in the Canadian High Arctic where astrobiologists study the potential for life on Jupiter‘s moon Europa. Water rich in sulfur-containing compounds flows from the top of this 656-foot-thick (200-meter-thick) glacier, a chemical mix that is capable of supporting microbial life. Europa’s icy surface is similarly stained with sulfate salts. If there’s life on Europa, studies of this glacier can help scientists decide how to best utilize the limited resources any probe sent there would have.

About National Geographic Society

The National Geographic Society is a global nonprofit organization that uses the power of science, exploration, education and storytelling to illuminate and protect the wonder of our world. Since 1888, National Geographic has pushed the boundaries of exploration, investing in bold people and transformative ideas, providing more than 14,000 grants for work across all seven continents, reaching 3 million students each year through education offerings, and engaging audiences around the globe through signature experiences, stories and content. To learn more, visit or follow us on Instagram, Twitter and Facebook.