Sentences with phrase «other planetary orbits»

Not exact matches

«During the past few years our group,» says David Jones, an astrophysicist at the IAC and another of the authors on the paper, «has discovered that the planetary nebulae with the biggest discrepancies in their abundances are usually associated with binary central stars which have been through a phase with a common envelope, that is to say the process of expansion of the more massive of the two stars has meant that the other star is orbiting within its outer atmosphere, and the viscosity has brought the stars very close to one another.

This scenario naturally produces a planetary system just like our own: small, rocky planets with thin atmospheres close to the star, a Jupiter - like gas giant just beyond the snowline, and the other giants getting progressively smaller at greater distances because they move more slowly through their orbits and take longer to hoover up material.

A bet the former had with other scientists on the nature of planetary orbits.

Other theories involve planetary collisions that knock worlds off course or simply a large mass of materiallike an asteroid that jumps aboard and, by its mass and impact, tilts the once - flat orbit.

For decades, astronomers have suspected that planetary nebulae — dazzlingly colorful shrouds of gas cast off by dying stars — owe their weird but often symmetrical shapes to the sculpting magnetic forces of two stars orbiting each other at the nebula's center.

Life on planets orbiting other stars doesn't have to literally broadcast its existence: Radio signals are just one way earthbound scientists might detect biological activity elsewhere in the universe, says Hanno Rein, a planetary scientist at the University of Toronto, Scarborough, in Canada.

Its dense iron core takes up 42 per cent of its volume, its orbit is less circular than that of the other planets, and current planetary formation models predict Mercury should be closer to the sun and bigger, so we know we're missing something.

Since the late 1980s, scientists have discovered nearly 5,000 planetary bodies orbiting stars other than the sun.

But the new evidence comes from a pair of respected planetary scientists, Konstantin Batygin and Mike Brown of the California Institute of Technology (Caltech) in Pasadena, who prepared for the inevitable skepticism with detailed analyses of the orbits of other distant objects and months of computer simulations.

Researchers used software to simulate the planetary motions within a two - planet system: one being a Jupiter - sized planet (depicted in the artist's concept above) orbiting its parent star at about the same distance Earth orbits the sun, and the other a large planet in a highly tilted orbit that was slightly larger.

The new study suggests that the «hot Jupiter» WASP - 18b, a massive planet that orbits very close to its host star, has an unusual composition, and the formation of this world might have been quite different from that of Jupiter as well as gas giants in other planetary systems.

For this study the researchers used images taken from Earth between 2008 and 2014; they used, among others, the astronomical cameras PlanetCam (developed by the Planetary Sciences Group itself) and Astralux, fitted to the telescopes of the Calar Alto Observatory in Almería (Spain); in addition, they used the very high resolution images obtained by t he Cassini spacecraft, which has been orbiting Saturn since 2004.

Other astronomers find the detections convincing, although most reserve the name «planet» for bodies that form within a planetary system and orbit stars, says theorist Alan Boss of the Carnegie Institution of Washington in Washington, D.C. «They should call them «planetary - mass brown dwarfs,»» Boss says.

In other cases, when a solar system contains more than 3 massive Jupiter - like planets, the orbits become unstable by the gravity of these planets and some of them may spin out the planetary system.

Possibilities for the cause of the orbital disturbance include interactions occurring from the inward migration of planets, the ejection of other planets from Star A's system through planet - to - planet scattering, or disruption from Star B. (See a larger, interactive animation of the planetary and potentially habitable zone orbits of this system, with a table of basic orbital and physical characteristics.)

Starting from the Earth's orbital speed of 30 kilometers per second (km / s), the change in velocity (delta - v) the spacecraft must make to enter into a Hohmann transfer orbit that passes near Mercury is large compared to other planetary missions.

In other words, planetary orbits that line up with the astrospheric current sheet, which is generally aligned with the star's equator, have a higher probability of being hit by a CME than planets in higher - inclination orbits.

However, many others argue that only planemos that directly orbit stars should qualify as planets, preferring to use the terms «planetary body,» «planetary mass object» or «planemo» for similar free - floating objects (as well as planet - size moons).

Some of them are orbiting extremely close to their parent star like the 51 Peg planetary system, while others are found to be at distances comparable to where Mars and Jupiter lie in our 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.

A flotilla of spacecraft orbiting Mars will be turning their instruments in two directions — one towards Comet Siding Spring, and the other towards Mars itself, to find out what happens when a planetary atmosphere brushes against the fuzzy atmosphere of a comet.

And, «In April 2008, it was announced that two simulations of long - term planetary movement, one at the Paris Observatory and the other at the University of California, Santa Cruz, indicate a 1 % chance that Mercury's orbit could be made unstable by Jupiter's gravitational pull sometime during the lifespan of the Sun.

NASA's Planetary Defense Coordination Office is charged with monitoring the paths of asteroids and other objects with orbits that could send them on a crash course with Earth, and planning for response to an actual impact threat.

MAUNAKEA, Hawaii — The search for planets orbiting other stars in our galaxy has revealed an extraordinary family of planets whose orbits are so carefully timed that they provide long - term stability for their planetary system.

Extrasolar planet, also called exoplanet, any planetary body that is outside the solar system and that usually orbits a star other than the Sun.

Such a planetary orbit is likely to be in synchronous rotation with its host star, so that one side is always facing the star with perpetual daylight while the other side is in perpetual darkness.

This means that without counting bonuses offered by other cards the most a planet can have is four buildings, thus four dice, which is why it's important to support valuable planets with fleets in orbit as attacking players must always destroy ships first before embarking on a planetary assault.

In the description of the DE200 planetary ephemeris, it is pointed out that, contrary to all the other objects in the computation which use the Solar system barycentre, the orbit of our own moon is computed relative to the Earth - Moon barycentre, because then, the orbit integration will behave nicer numerically — which is good, as the Moon is an object of special interest.

The 9.1 year cycle appears to be linked to a Soli / Lunar tidal cycles, as I also show in the paper, while the other three cycles appear to be solar / planetary cycles ultimately related to the orbits of Jupiter and Saturn.