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neutron star
NOUN
1.
an extremely dense, compact star composed primarily of neutrons, especially the collapsed core of a supernova.
Source: Dictionary.com
neutron stars | Define neutron stars at Dictionary.com
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en.wikipedia.org/wiki/Neutron_star

A neutron star is the collapsed core of a large (10–29 solar masses) star. Neutron stars are the smallest and densest stars known to exist. Though neutron stars ...

www.space.com/22180-neutron-stars.html

Jul 31, 2013 ... Neutron stars are created when giant stars die in supernovas and their cores collapse, with the protons and electrons essentially melting into ...

imagine.gsfc.nasa.gov/science/objects/neutron_stars1.html

Mar 16, 2017 ... A neutron star is the densest object astronomers can observe directly, crushing half a million times Earth's mass into a sphere about 12 miles ...

www.nasa.gov/mission_pages/GLAST/science/neutron_stars.html

Neutron Stars. 08.23.07. When the core of a massive star undergoes gravitational collapse at the end of its life, protons and electrons are literally scrunched ...

www.nationalgeographic.com/science/space/solar-system/neutron-stars

These interesting objects are born from once-large stars that grew to four to eight times the size of our own sun before exploding in catastrophic supernovae.

kipac-web.stanford.edu/research/Neutronstarts_Pulsars

Neutron Stars A neutron star is the product of the explosive transformation of a massive star. Any star's life is a careful balancing act: the gravity of its own ...

www.astro.umd.edu/~miller/nstar.html

Welcome to my neutron star page! I need to emphasize that the stuff I have here represents my opinions, and errors aren't the fault of those patient pedagogues ...

www.symmetrymagazine.org/article/five-extreme-facts-about-neutron-stars

Jan 24, 2017 ... Neutron stars have earned their share of superlatives since their discovery in 1967.