Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because

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Quizplus · Accepted Answer

Neutron stars have a small surface area from which to emit, making them faint at visual wavelengths. Additionally, the peak of their thermal emission is at much shorter wavelengths than visual, which further reduces their visibility at visual wavelengths. Neutron stars have a small surface area from which to emit and the peak of their thermal emission is at much shorter wavelengths than visual, making them both faint and not easy to see at visual wavelengths.

Although Neutron Stars Are Very Hot, They Are Faint and Not