Following the Voyager visits, scientists theorized that particles can be cleared from a region to form a gap by the gravitational effects of a moon about 10 km (6 miles) in size orbiting within the gap region.
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Platzer said, "As use cases, sizes, orbit requirements, launch requirements for satellites are changing, there is a need for a more differentiated offering from launch service providers".
In other words, one in five of such stars has an Earth-size orbiting world in the so-called "habitable zone".
But while Kepler can determine exoplanets' size and orbit, it cannot measure their mass.
But it allowed for a prediction: if there really was a planet with the size and orbit they had calculated, there should be a small class of Kuiper Belt objects in its path that have been tilted on their sides.
A few red supergiants, such as the variable star VV Cephei, exceed in size the orbit of Jupiter or even that of Saturn, although most of them are smaller.
Because of that enormous size, the orbit was much smaller back then; Sirius A was practically skimming the outer layers of Sirius B, Liebert says.
Despite the difference in size, age, orbit, and source of origin, the vast majority of comets shows very similar photopolarimetric characteristics in the visible (see Kolokolova et al., 2004a, 2004b, and references therein).
The current, general debris mitigation and protection measures may be applied to GEO satellites, but characterizing the GEO debris environment (flux, size distribution, orbit distribution, sources) will also allow measures tailored specifically for that environment.
