The prospects
for the habitability of M - dwarf planets have long been debated, due to key differences between the unique stellar and planetary environments around these low - mass stars, as compared to hotter, more luminous Sun - like stars.
Not long ago, while making a presentation about possible destinations for an interstellar probe, I called Gl 581d the most likely
candidate for habitability yet discovered among nearby stars.
Oceanus, which is designed to look at Titan's
potential for habitability by examining organic molecules «through the methanologic cycle and assessing exchange processes between the atmosphere, surface and subsurface,» according to a project description presented at the 48th Lunar and Planetary Science Conference in The Woodlands, Texas.
However, Brain and his colleagues have considered a particularly challenging situation
for habitability by placing Mars around an M - class star.
Feng says this capture could be a good
sign for the habitability of Proxima b. Sometimes, Alpha Centauri A and B may get close enough to Proxima b to destabilise its orbit and push it out of its star's habitable zone, where temperatures are right for life.
Such unexpected atmospheric structures may also have
consequences for habitability, given that most of the planet would not be protected against ultraviolet (UV) radiation.
The implications
for habitability in these systems were the focus of the Division of Planetary Sciences meeting.
With such a narrow
range for habitability, ocean planets may not make as much of a splash as we thought when it comes to welcoming life.
ASU scientists Cayman Unterborn, Steven Desch, and Alejandro Lorenzo of the School of Earth and Space Exploration, with Natalie Hinkel of Vanderbilt University, have been studying these
planets for habitability, specifically related to water composition.
Even the miserably cold Pluto -LRB--- 400 degrees Fahrenheit at present) will be too
hot for habitability.
With this finding, Cassini has shown that Enceladus — a small, icy moon a billion miles farther from the sun than Earth — has nearly all of these
ingredients for habitability.
The scientists think hydrogen peroxide is an important
factor for the habitability of the global liquid water ocean under Europa's icy crust because hydrogen peroxide decays to oxygen when mixed into liquid water.
Such an issue can play a significant role in identifying possible
conditions for habitability, one of the main targets of the upcoming ESA JUICE mission.
We suggest that the habitability of red dwarf systems may peak in the far future, while the present time is
optimal for habitability around yellow and orange dwarf stars.
Drabek - Maunder says: «Recent discoveries that icy moons in our outer Solar System could host oceans of liquid water and ingredients for life have sparked exciting
possibilities for their habitability.
«But we can't do that thoroughly enough that we can safely dispose of the spacecraft in one of these alien worlds that we may one day want to someday
explore for habitability and look for life — we don't want to discover the life that we brought there!»
The steep drop off in high - energy activity for Sun - like and lower mass stars after 1 billion years is good
news for the habitability of exoplanets orbiting these stellar bodies, as the atmospheres of these worlds would not have to endure as much radiation as previously believed.
If the new computer simulations are correct, the trapping of ozone in the equatorial region of tidally locked exoplanets could be a bad
indicator for the habitability of these worlds.
As for Viking's prime mission, how do you search for life on a planet when there are so many things that are unknown about the current and past conditions, and potential
for habitability overall?
These two discoveries have not only extended the time -
frame for the habitability of early Mars but lead one to wonder where else groundwater was present on the planet.
«From the Hadean zircons we can understand further what the thermal consequences for the crust were, and test our
models for habitability during the late heavy bombardment.
This new planet is a gas giant and definitely not habitable, but the possible universe of exoplanets that just might meet some of the basic
criteria for habitability may well have grown.
Of particular interest are planets that receive similar amounts of stellar radiation as the Earth, as they could support liquid water, probably the most critical
requirement for habitability.
NASA announced this week the creation of the Nexus for Exoplanet Systems Science (NExSS) network that will study planets beyond our solar
system for habitability and other features tapping the expertise of researchers at NASA's Goddard Institute for Space Studies, Goddard Space Flight Center and other locations.
Results suggest a more optimistic
prognosis for the habitability of atoll nations and demonstrate the importance of resolving recent rates and styles of island change to inform adaptation strategies.
Orbital variations are also likely to be a generic feature of other planets, with strong implications for the fate of planetary atmospheres (for example, understanding the potential
for habitability on other systems).
If you're stretching to get into a single - family home and looking at fixer - uppers, keep in mind that some financing types (FHA, etc.) require a house to satisfy minimum
thresholds for habitability.
«We can't say for sure whether these planets are truly habitable — only that they are promising
candidates for habitability,» says study co-author David Kipping, an astronomer at the Harvard — Smithsonian Center for Astrophysics (CfA) in Cambridge, Mass..
These are encouraging
signs for habitability, but it was unclear whether the geysers were erupting from an ocean or from water pockets that wouldn't last long enough for life to get a toehold.
«Given the concerns about our own environment and climate change, finding an exoplanet that might experience the runaway greenhouse much sooner than we will made us reflect on the Earth's near - and long - term
prospects for habitability,» Jenkins says.
Such unexpected atmospheric structures may also have
consequences for habitability, given that most of the planet would not be protected against UV radiation.
«It is only if the pressure is sufficiently low,» he said, «and if the exoplanet has a reasonably strong magnetic shield like that of the Earth's magnetosphere, that the exoplanet can retain an atmosphere and has the
potential for habitability.»
«On Mars you can not look for life with the tools that have been looking
for habitability of that planet,» she argues.
«Discovery of boron on Mars adds to evidence
for habitability: Boron compounds play role in stabilizing sugars needed to make RNA, a key to life.»
Planets that are regularly swapped between their stars may be unlikely candidates
for habitability, but the more compact a planetary system, the less likely a planet will be stolen by a passing star.