:: : : : Your re-written version mentions : gravity ( although not the Sun's ); hints at the plane of the ecliptic; nearly circular orbits ( but fails to name them as ellipses ); the Heliosphere; the solar wind; and the interstellar medium.
32.
In our solar system, the planets in general revolve around the sun in nearly circular orbits, while the newfound gas planets fly in " eccentric " elliptical orbits that would alternately freeze and melt any Earth-like planets there if they existed at all, Marcy said.
33.
Its orbital characteristics are substantially different from those of the planets, which follow nearly circular orbits around the Sun close to a flat reference perihelion on September 5, 1989, and was last closer to the Sun than Neptune between February 7, 1979, and February 11, 1999.
34.
Intermediate between the case of Mercury and the case of an object falling past the event horizon, there are exotic possibilities such as knife-edge orbits, in which the satellite can be made to execute an arbitrarily large number of nearly circular orbits, after which it flies back outward.
35.
They orbit around their common barycenter in a nearly circular orbit with a separation of about 147 flares and they have been given variable star designations : the brighter member Groombridge 34 A is designated " GX And ", while the smaller component is designated " GQ And ".
36.
By contrast, Comet 1996 N2, identified by Eric Elst at the Belgian Royal Observatory in Brussels from photographs made in Chile at the European Southern Observatory, clearly exhibits a tail, but unlike normal comets, it has a nearly circular orbit at about three times Earth's distance from the sun, an orbit typical of an asteroid.
37.
The Sun travels in a nearly circular orbit ( the " solar circle " ) about the center of the Milky Way at a speed of about 220 km / s at a radius of from the center, which can be taken as the rate of rotation of the Milky Way itself at this radius.
38.
To make his theorem applicable to other types of forces, Newton found the best approximation of an arbitrary central force " F " ( " r " ) to an inverse-cube potential in the limit of nearly circular orbits, that is, elliptical orbits of low eccentricity, as is indeed true for most orbits in the Solar System.
39.
Using the formula for " k " for nearly circular orbits, and estimates of " A " and " B ", Newton showed that this force law could not account for the Moon's precession, since the predicted apsidal angle " ? " was ( H " 180.76?) rather than the observed ? ( H " 181.525?).
