Cycling Nitrogen in Ancient Oceans
In recent years, scientists have found evidence that a 'near complete' biological nitrogen cycle existed in the oceans during the late Archean to early Proterozoic (from 2.5 to 2 billion years ago).
National Geographic "Emerging Explorer" Kevin Hand
The best chance of discovering life beyond Earth may not be where you'd expect. Today's weather forecast for Europa, Jupiter's fourth largest moon, is 280 degrees below Fahrenheit- and astrobiologist Kevin Hand can hardly wait to get there.
Islands of Life, Part 1
The Atacama Desert in northern Chile is one of the driest places on our planet, and astrobiologists have long studied this unique location as an analog environment for ancient Mars.
A Hot, Acidic Primordial Soup
A new study has revealed that a group of ancient enzymes adapted to substantial changes in ocean temperature and acidity during the last four billion years.
A Tale of Two Deserts
All life as we know it needs water. But what organisms can survive when water is all but unavailable? To find out, one scientist is looking at soil from two of the driest places on Earth.
The Importance of Being Magnetized
Despite its magnetic field, Earth is losing its atmosphere to space at about the same rate as planets that lack this protective barrier against the solar wind.