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., and Mil...
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 ...
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 ...
Astrophysics - Solar and Stellar AstrophysicsThe Gl 581 planetary system has generated wide interest, because its 4 planets include both the lowest mass planet known around a main sequence star other than the Sun and the first super-Earth planet in the habitable zone of its star. A recent ...
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 )...
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 ...
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...
The most important reason for their visitation to earth at this time is that our whole solar system is at this time in transit into a new area of space, a new density, and that this is changing the vibratory rate of the nucleus of every atom in our planet, raising it to a higher fr...
stars: solar-typestars: activitystars: abundancessurveysContext. 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 ...