Sentences with phrase «planetary orbits around each star»

Finally, noncoplanarity between the component stars of a binary system should not have a significant impact on the stability of close - in planetary orbits around each star (Alan Hale, 1994).

Not exact matches

A solitary planet in an eccentric orbit around an ancient star may help astronomers understand exactly how such planetary systems are formed.

The International Astronomical Union defines «planet» as a celestial body that, within the Solar System that is in orbit around the Sun; has sufficient mass for its self - gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape; and has cleared the neighbourhood around its orbit; or within another system, it is in orbit around a star or stellar remnants; has a mass below the limiting mass for thermonuclear fusion of deuterium; and is above the minimum mass / size requirement for planetary status in the Solar System.

Nearly every one of these exoplanets has been discovered in orbit around a mature star with a fully evolved planetary system.

In one case, an Earth - sized planet could orbit in the habitable zone (capable of having liquid water on their planetary surface) around two stars close together.

A solitary planet in an eccentric orbit around an ancient star may help astronomers understand exactly how such planetary systems are formed.

-- If the central star of a planetary system burns out, there will be no further evolution of life on the planets that have orbits around it.

Assuming that the spectroscopic companion B does not preclude a stable inner planetary orbit, the distance from Star A where an Earth - type planet would be «comfortable» with liquid water is centered around only 0.457 AU — between the orbital distances of Mercury and Venus in the Solar System.

On the other hand, the discovery of a brown dwarf companion in a wide orbit that could perturb dormant comets in an Oort Cloud around Epsilon Indi inwards towards the star's inner planetary regions may periodically shower an Earth - type, inner planet with catastrophic impacts.

However, if the existence of a relatively close, second companion (see Star Bc below) around Bab — with an orbital period of 2.2 to 2.9 years or less — is confirmed, then a planetary orbit in Star Ba's water zone may not be stable over the long run.

Adding to the recent spate of planetary finds, astronomers from NASA's Goddard Space Flight Center and San Diego State University (SDSU) announced yesterday they've discovery the largest - known planet to orbit two stars, confirming theories about large planets around binary systems.

However, the giant planetary companion «A1» or «b» recently discovered around Star A could disturb the stability or the development of such a rocky planet in this orbit.

On July 21, 2003, some astronomers provided evidence from recent discoveries of giant extrasolar planets in mostly inner orbits around host stars that planetary systems may be more common around stars whose spectra show an enriched abundance of elements heavier than hydrogen and helium — also called high «metallicity» (exoplanets.org press release; and Gonzalez, 1999).