Typical diameter20,000 m
20 quadrillionGamma ray wavelengths
667Lighthouse heights
About 20 km
Photo from Wikimedia Commons
Neutron Star (typical)
A collapsed stellar core with incredible density/Deep Space
A neutron star is the dense remnant core left behind after a massive star explodes as a supernova. Packing about 1.4 solar masses into a sphere only 20 km across, their density rivals that of an atomic nucleus. A teaspoon of neutron star material would weigh about 6 billion tonnes on Earth. The fastest neutron stars (pulsars) can spin hundreds of times per second.
Measurements
Typical mass2.8 nonillion kg
1 octillionBlue whale tongues
5.8 octillionConcert grand pianos
1.9 octillionSedans
About 1.4 solar masses
Spin frequency (fast pulsar)716 Hz
292 billionthsMicrowave frequencies
11.9Rattlesnake rattles
PSR J1748-2446ad, fastest known pulsar at 716 rotations per second
Rotation period (fast pulsar)1.4 thousandths s
1.2 millionthsHalftime shows
7.8 millionthsCommercial breaks
194 billionthsNaps
Period of PSR J1748−2446ad
Surface temperature (young)1 million K
3,209Human fevers
2,096Fresh pizza ovens
265Welding torches
Young neutron stars; cools over millions of years