In group fA the parameter ne is understood as the number of planets capable of sustaining life. By means of ne Drake defines this possibility exclusively from the geometric point of view. In particular, the planet's orbit must be included in the circumstellar space in which the planetary ...
During planet formation, rock and ice embryos of the order of Earth's mass may be formed, some of which may be ejected from the Solar System as they scatter gravitationally from proto-giant planets. These bodies can retain atmospheres rich in molecular hydrogen which, upon cooling, can have ...
We modeled the evolution of the Milky Way to trace the distribution in space and time of four prerequisites for complex life: the presence of a host star, enough heavy elements to form terrestrial planets, sufficient time for biological evolution and an environment free of life-extinguishing super...
Given their size and proximity to their low-intensity star, all three planets may have regions at temperatures within a range suitable for sustaining liquid water and life, the study concluded. Their proximity to Earth means scientists will be able to find out a lot more. “These planets are ...
The long-term presence of surface liquid water depends upon the maintenance of a climate capable of sustaining the specific range of temperatures and pressures necessary to keep water in its liquid form. Over the past decade, the exploration and analysis of the potential habitability of extrasolar ...
habitable zones—a region around a star where rocky planets are capable of sustaining liquid water and therefore life. That study used habitable zone limits calculated in 1993 by Jim Kasting, now an Evan Pugh Professor in Penn State’s Department of Geosciences. Kopparapu noticed that its findin...
By applying models of varying complexity in atmospheric and orbital dynamics, previous studies have found that Earth-like planets on circumbinary orbits may indeed be capable of sustaining liquid water on their surface for a substantial amount of time4–11. One of the challenges in determining ...
We discuss the evolution of the atmosphere of early Earth and of terrestrial exoplanets which may be capable of sustaining liquid water oceans and continen... H Lammer,KG Kislyakova,P Odert,... - 《Origins of Life & Evolution of the Biosphere the Journal of the International Society for th...
Are we alone in the unfathomable vastness of the universe? Or are there other planets capable of generating and sustaining life in an atmosphere similar to... A Boss - 《Wiley & Sons》 被引量: 16发表: 1998年 Discovering Extrasolar Planets with Microlensing Surveys An astronomical survey is ...
In this scenario, the migration of the planet through the inner solar system would have certainly ejected any preexisting planets from their orbits (or worse), precluding them from sustaining life. However, the authors in [31] hypothesize that this entire process could happen early enough that ...