Assertion: nebula's star | /r/CapableOf | enter the ppn phase
Facets:
Source sentences:
text: When this phase comes to an end, the star enters the PPN phase, where it is energized by a central star, causing it to emit strong infrared radiation and become a reflection nebula.
text: When this phase comes to an end, the star enters the PPN phase.
text: When this phase comes to an end, the star enters the PPN phase.