Assertion: nebula's star | /r/HasProperty | hot
Facets:
value: very
type: DEGREE
value: sometimes
type: DEGREE
value: near the center of the view
type: LOCATION
value: as —
type: DEGREE
value: from their spectra
type: LOCATION
Source sentences:
text: The central stars in young planetary nebulae are about as hot as the massive O and B stars—35,000–40,000 K—but roughly 10 times fainter.
text: The nebulae are approximately a light year in size and are illuminated and ionized by the hot central star.
text: Near the center of the view, the star itself is one of the hottest known, with a surface temperature of about 200,000 kelvins.
text: Known as a Wolf-Rayet star, the central star is an extremely hot giant thought to be in a brief, pre- supernova stage of evolution.
text: The dying central star is one of the hottest known stars in the galaxy.
text: The central stars of planetary nebulae are very hot.
text: The secondary star is hot and also highly luminous, probably of spectral class O, around 30–80 times as massive as the Sun.
text: These stars were hot and luminous and the ultraviolet light they emitted stripped electrons from interstellar hydrogen gas in all directions.
text: With an estimated surface temperature of about 250,000 degrees C, the central star of this particular planetary nebula is exceptionally hot though -- shining brightly in ultraviolet light but hidden from direct view by a dense torus of dust.
text: Many central stars are known from their spectra to be very hot.
text: If those stars are hot and massive, they'll energize the nebula.
text: Also, the stars are hot and tend to be blue, and so the light we see from these nebulae is blue as well.
text: If there's enough gas, sometimes these newborn stars are massive and hot, and blow out a fierce wind of particles.
text: You may by wondering to yourself, “Why are we looking for something dark and cold when stars are bright and hot?