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...orbit and composition similar to Pluto, Triton is thought to have been a [[dwarf planet]], captured from the [[Kuiper belt]].<ref name="Agnor06"/> ...grade orbits cannot form in the same region of the [[solar nebula]] as the planets they orbit, so Triton must have been captured from elsewhere. It might ther ...

...to objects that exert a gravitational force on themselves, such as stars, planets, black holes or [[Cavendish experiment]]s. The second part is the Einstein ...stem including a millisecond [[pulsar]] [[PSR J0337+1715]] and two [[white dwarf]]s orbiting it. The system provided them a chance to test the strong equiva ...