Assertion: pulsar's surface | /r/HasProperty | hot
Facets:
Source sentences:
text: Over time, the surface cools, but while the surface is still hot enough, it can be seen with X-ray telescopes.
text: While the surface is still hot enough, it can be seen with X-ray telescopes.
text: While the surface is still hot enough, it can be seen with X-ray telescopes.