MODULE:KNOWLEDGE-BASE
SIMULATION: ACTIVE
RETURN::Stellar Physics

Stellar Remnants

White Dwarfs, Neutron Stars & Black Holes

Three Endpoints of Stellar Evolution

Sizes are not to scale — actual radii span ~6,400 km (white dwarf), ~10 km (neutron star), and the mass-dependent Schwarzschild radius (black hole).

Formation Pathways

A star's final form is determined almost entirely by its initial mass. As nuclear fusion ends, gravity wins — but how far it crushes the core depends on what's there to push back.

Below the Chandrasekhar limit (1.4 M☉), electron degeneracy pressure halts collapse → white dwarf. Above it, degenerate neutrons resist further collapse up to the TOV limit (~2.5 M☉) → neutron star. Beyond that, no known force halts gravity → singularity.

Detection Signatures
White DwarfFaint thermal glow, distinctive absorption spectra
Neutron StarPulsar beams, X-ray binaries, magnetar bursts
Black HoleAccretion X-rays, gravitational lensing, GW chirps
ED: Hazards & Hooks

None of the remnants are fuel-scoopable — they cannot replenish FSD reserves.

Neutron stars emit a polar jet cone that supercharges the FSD, extending jump range by up to 300%. The backbone of the Colonia Highway and most long-range expedition routes.

Black holes have no jet but generate striking gravitational lensing visible up close. Approach with a fully fuelled FSD and watch your heat.

Comparative Reference

White Dwarf

Progenitor≤ 8 M☉
Final mass≤ 1.4 M☉
Radius≈ Earth (~6,400 km)
Density~10⁹ kg/m³
Forms viaPlanetary nebula

Sirius B, Procyon B

Neutron Star

Progenitor8 – 25 M☉
Final mass1.4 – 2.5 M☉
Radius~10 km
Density~10¹⁷ kg/m³
Forms viaType II supernova

Crab Pulsar, Vela

Black Hole

Progenitor≥ 25 M☉
Final mass≥ 2.5 M☉
RadiusSchwarzschild = 2GM/c²
DensitySingularity
Forms viaDirect collapse / hypernova

Cygnus X-1, Sgr A* (SMBH)