If a small, rocky planet can develop without the interference of planet b,
then stable orbits appear to be possible in the inner portion of the habitable zone (Noble et al, 2002, in pdf; and Jones and Sleep, 2003).
Not exact matches
For example, William Paley, already in 1802, in his treatise Natural Theology, pointed out that if the law of gravity had not been a so «called «inverse square law»
then the earth and the other planets would not be able to remain in
stable orbits around the sun.
Assuming all goes well, Chang Díaz says, Ad Astra will
then pursue multiple near - term applications of VASIMR, such as periodically nudging the space station and other large satellites into
stable orbits.
The robotic spacecraft would be capable of approaching the asteroid, characterising it, capturing it, and
then redirecting it to a final
stable orbit that would be closer to Earth and thus easier for astronauts to reach.
The spacecraft
then will attempt to redirect the object into a
stable orbit around the moon.
While Hamers thinks that the earth will
then remain in a
stable orbit, this is really only small consolation: around the same time, the sun will grow into a «red giant» and completely engulf the earth.
Then in 2011, Goddard engineer Donald Dichmann, who at the time worked for Applied Defense Solutions in Columbia, Md., and his co-authors began work on a paper reviewing the trade studies NASA made when it decided to move its Interstellar Boundary Explorer from its original
orbit to a more
stable position at another lunar - resonant
orbit — P / 3 — where it's mapping the boundary between the solar system and interstellar space.
But rather than slipping into a
stable arrangement the way Jupiter's four moons did, in Hamilton's scenario the
orbits of Saturn's initial moons became unstable and began to overlap and
then the moons collided with one another.
Now, Hippke and Heller show that a combination of the stars» gravity and radiation pressure from their photons can bring the craft into a
stable orbit around one of the stars,
then around the tantalising planet (Astrophysical Journal Letters, doi.org/bx8t).
If so,
then conditions would be more favorable for the existence of
stable orbit for an Earth - like planet (with liquid water) centered around 1.5 AU from around Iota Persei — around the orbital distance of Mars in the Solar System.
If so,
then conditions would be more favorable for the existence of
stable orbit for an Earth - like planet (with liquid water) centered around 1.15 AU from around 15 Sge — between the orbital distances of Earth and Mars in the Solar System.
If so,
then conditions would be more favorable for the existence of
stable orbit for an Earth - like planet (with liquid water) centered around 1.12 AU from around 37 Gem — between the orbital distances of Earth and Mars in the Solar System.
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.