Assertion: pulsar's companion | /r/HasProperty | white dwarf stars
Facets:
value: often
type: TEMPORAL
value: for one recent discovery
type: CAUSE
Source sentences:
text: The companions to pulsars have been found to be normal stars, planets, white dwarf stars, neutron stars and even, for one recent discovery, another pulsar.
text: A binary pulsar is a pulsar with a binary companion, often a white dwarf or neutron star.
text: Generally, this companion is a dying star called a white dwarf; more than 180 millisecond pulsars have been found with white dwarfs over the years.
text: The companions to pulsars have been found to be normal stars, planets, white dwarf stars, neutron stars and even, for one recent discovery, another pulsar.