1.   Some years later Newton, using his newly discovered law of gravity, proved that all objects must orbit in elliptical paths.

2.   That changing curvature, in turn, determines exactly how the objects orbit about one another or fall together.

3.   The large object is orbiting a red dwarf star less than one-third the mass of the Sun.

4.   When he could not, it dawned on him that perhaps he was wrongly assuming that the object was orbiting the Sun.

5.   Helin, however, worried that missing something this big for so long indicates that smaller objects could be orbiting far closer to Earth.