An essential characteristic of life is that it evolves. Whether on Earth or potentially Mars, Europa or distant exoplanets, we can assume that whatever life might be present has the capacity and the need to change. Evolution is intimately tied to the origin-of-life question, which this column often explores. Having more answers regarding how life …
Continue reading "Piecing Together The Narrative of Evolution"
Far beneath the frigid surface of the South Pole of Mars is probably the last place where you might expect the first large body of Martian liquid water would be found. It's -170 F on the surface, there are no known geothermal sources that could warm the subterranean ice to make a meltwater lake, and …
Continue reading "Large Reservoir of Liquid Water Found Deep Below the Surface of Mars"
The first exoplanets were all found using the radial velocity method of measuring the "wobble" of a star -- movement caused by the gravitational pull of an orbiting planet. Radial velocity has been great for detecting large exoplanets relatively close to our solar system, for assessing their mass and for finding out how long …
Before the discovery of the first exoplanet that orbits a star like ours, 51 Pegasi b, the assumption of solar system scientists was that others planetary systems that might exist were likely to be like ours. Small rocky planets in the inner solar system, big gas giants like Jupiter, Saturn and Neptune beyond and, back …
Early this spring, the organizers of an exoplanet science gathering at Cambridge University put out the word that they would host a major meeting this summer. Within a week, the 300 allotted slots had been filled by scientists aspiring and veteran, and within a short time the waiting list was up to 150 more. …
What does NASA's drive to return to the moon have to do with worlds of exoplanets and astrobiology that are generally discussed here? The answer is actually quite a lot. Not so much about the science, although current NASA plans would certainly make possible some very interesting science regarding humans living in deep space, as …
Just as the number of planets discovered outside our solar system is large and growing -- more than 3,700 confirmed at last count -- so too is the number of ingenious ways to find exoplanets ever on the rise. The first exoplanets were found by measuring the "wobble" in their host stars caused by the …
Continue reading "Planets Still Forming Detected in a Protoplanetary Disk"
A decades-long quest for incontrovertible and complex Martian organics -- the chemical building blocks of life -- is over. After almost six years of searching, drilling and analyzing on Mars, the Curiosity rover team has conclusively detected three types of naturally-occurring organics that had not been identified before on the planet. The Mars organics Science …
Continue reading "Breakthrough Findings on Mars Organics and Mars Methane"
The world of biology is filled with labs where living creatures are cultured and studied, where the dynamics of life are explored and analyzed to learn about behavior, reproduction, structure, growth and so much more. In the field of astrobiology, however, you don't see much lab biology -- especially when it comes to …
Continue reading "Joining the Microscope and the Telescope in the Search for Life Beyond Earth"
When thinking and talking about "astrobiology," many people are inclined to think of alien creatures that often look rather like us, but with some kind of switcheroo. Life, in this view, means something rather like us that just happens to live on another planet and perhaps uses different techniques to stay alive. But as defined …
Many Worlds 