Natural transfer of viable microbes in space from planets in extra-solar systems to planet in our solar system and vice versa. Ap.J. 690, 210-215Valtonen, M., Nurmi, P., Zheng, J.-Q., Cucinotta, F. A., Wilson, J. W., Horneck, G., Lindegren, L., Melosh, J., Rickman, H...
13.Comets are probably the most numerous astronomical bodies in the solar system aside from small meteor fragments and the asteroids.在太阳系中,除流星小碎块和小行星之外,彗星也许可以说是数量最多的天体了。 14.And it is the second smallest planet in our solar system.又是太阳系里倒数第二颗最小...
Are there extra-terrestrials?(1)Many scientists today believe that life exists elsewhere in the universe - life probably much like that on our own planet. They reason in the following way.(2)As far as astronomers can determine, the entire universe is built of the same matter. They have ...
In addition, we examine the system HD74156 which did not contain such a stable zone. In Table 2, we present the initial conditions for the simulations of each system, including the parameter space sampled and the number of Saturn-mass planet experiments. Table 3 summarizes our results. 3.1....
The discovery of the first extra-solar planet surrounding a main-sequence star was announced in 1995, based on very precise radial velocity (Doppler) measurements. A total of 34 such planets were known by the end of March 2000, and their numbers are growing steadily. The newly-discovered sys...
the planet Mp (E ) (E meaning Earth mass here): (years) j tj(msec) 1:5 PM ( ) 2=3 Mp (E ) sin i; (7) where P is the period of modulation of j tj (i.e. the orbital period of the planet) and M ( ) is the mass of the pulsar in solar masses (nominally, 1:35M )...
metalrichplanetbearingstarHD160691.Ournewsolutionconfirmsthepre- viouslyreportedplanetandshowsatrendindicatingasecond,longer-period companion.Thesediscoveriesaddtothegrowingnumbersofmidly-eccentric, long-periodextra-solarplanetsaroundSun-likestars.Asseemstobetypical ofstarswithplanets,bothstarsaremetal-rich. c ...
Moons orbiting planets outside our solar system could offer another clue about the pool of worlds that may be home to extra-terrestrial life, according to an astrophysicist at the University of Lincoln.
Context. The search for planets orbiting metal-poor stars is of utmost importance for our understanding of planet formation models. However, no dedicated searches have been conducted so far for very low mass planets orbiting such objects. Only a few cases of low-mass planets orbiting metal-poor...
It is thus the known exoplanet that most resembles our own Earth. The other planet has a 7.7 mass and orbits at 0.25 AU from the star, close to the “cold” edge of the habitable zone. These two new light planets around an M3 dwarf further confirm the formerly tentative statistical ...