Sentence:  We review two main scenarios that may have implanted <WSD>Sedna</WSD>, 2004 VN112 and 2000 CR105 on their current peculiar orbits. 
Meaning of the word marked with <WSD> tags:  (Q15610) (90377 Sedna), a trans-Neptunian object, possibly a dwarf planet, whose eccentric detached orbit is wholly beyond the Kuiper belt.