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astronomy
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<span class="apple-tab-span"> </span>•<span class="apple-tab-span"> </span>black holes: formed when the core remaining after a supernova is massive enough (exceeding about 3 solar masses) that gXXXXXX overcomes all XXXXXX, XXXXXXXXXX the XXXXXX XX a singularity. XXX event horizon XXXXX the boundary XXXXXX XXXXX nothing XXXXXXX, XXX even light.<XX>physical XXXXXXXXXX<br>&XX;span XXXXX="apple-tab-span"> &XX;/span&XX;•<span class="XXXXX-tab-span"> </span>neutron XXXXX<br>&XX;span XXXXX="XXXXX-tab-span"> </span&XX;•<span class="apple-tab-span"> &XX;/span>made XXXXXX entirely of XXXXXXXX.<br><span class="XXXXX-tab-span"&XX; </span&XX;•<span XXXXX="XXXXX-tab-span"&XX; </span&XX;XXXXXXXXX dense: a sugar-XXXX-sized piece XXXXX weigh as much as XXX XX humanity.<br>&XX;span XXXXX="apple-tab-span"> &XX;/span>•&XX;span class="XXXXX-tab-span"> </span>XXXXXXXX XXXXXXXXX ~XX XX.<XX><span class="apple-tab-span"&XX; &XX;/span>•<span XXXXX="XXXXX-tab-span"&XX; &XX;/span&XX;XXXXXXX gravity XXXXXXX but less than XXXXX XXXXX; XXXXXXXX XXXXXX are XXXXXXXXXX XXXXXX (magnetars/XXXXXXXXXXX XXXXX earth).<br>&XX;span class="apple-tab-span"&XX; &XX;/span&XX;•<span class="XXXXX-tab-span"> </span>XX not XXXX an XXXXX horizon.<br>&XX;span class="apple-tab-span"&XX; </span>•&XX;span XXXXX="apple-tab-span"> </span>black holes<br><span class="XXXXX-tab-span"&XX; &XX;/span>•<span class="XXXXX-tab-span"&XX; &XX;/span>defined by an event horizon&XXXXX;a boundary XXXX XXXXX XXXXXXX escapes.<XX>&XX;span class="apple-tab-span"&XX; &XX;/span&XX;•&XX;span XXXXX="apple-tab-span"> </span&XX;XXXXXXXXXXX XX XXXXXX, where density theoretically XXXXXXX XXXXXXXX.<XX>&XX;span XXXXX="XXXXX-tab-span"&XX; &XX;/span>•&XX;span XXXXX="XXXXX-tab-span"&XX; &XX;/span>XXXX (XXXXX horizon radius) XXXXXXXXXXXX to mass (e.g., sun-XXXXX black hole ~X km radius).<br><span XXXXX="apple-tab-span"&XX; &XX;/span>•<span XXXXX="apple-tab-span"> &XX;/span>XXX XXXX XXX mass, XXX those XXXXXX from stellar collapse are at least twice the sun’s.<XX>&XX;span XXXXX="apple-tab-span"&XX; </span>•&XX;span class="apple-tab-span"&XX; </span>XX XXXXXXX, XXXX a XXX-XXX XXXXXXXX.<XX>effects on XXXXXXXXXXX XXXXX<br><span class="XXXXX-tab-span"> &XX;/span&XX;•&XX;span class="XXXXX-tab-span"&XX; &XX;/span&XX;XXXXXXX XXXXX<XX>&XX;span XXXXX="apple-tab-span"&XX; </span>•<span XXXXX="apple-tab-span"&XX; &XX;/span&XX;XXX XXXX XXXXXXX XXXXX of XXXXXXXXXXXXXXX radiation XX XXXXXXX.<XX><span class="apple-tab-span"> </span&XX;•<span class="apple-tab-span"> &XX;/span&XX;XXXXXXXX XXXXXX and fast rotation XXX XXXX out XXXXXXXXX and XXXXXXXXX, XXXXXXXXX nearby space.<br><span class="XXXXX-tab-span"&XX; &XX;/span&XX;•&XX;span class="apple-tab-span"&XX; </span>binary XXXXXXX stars merging: create XXXXXXXXXXXXX waves, forge XXXXX XXXXXXXX, XXXX XXXXXXXXXXXX.<XX>&XX;span class="apple-tab-span"> &XX;/span&XX;•<span XXXXX="apple-tab-span"&XX; &XX;/span>XXXXX holes<br>&XX;span XXXXX="XXXXX-tab-span"&XX; </span>•<span XXXXX="XXXXX-tab-span"&XX; </span&XX;gravitational influence XXXXX XXXXXXXXX; XXXXXXX XXXXXXX XXXX XXXXXX event XXXXXXX.<br><span class="apple-tab-span"&XX; &XX;/span&XX;•<span XXXXX="apple-tab-span"&XX; </span&XX;XXXXXXXXX disks and XXXX can superheat matter, XXXXXXX XXXXXX, XXX shape XXXXXX XXXXXXXXX.<br><span class="XXXXX-tab-span"> </span&XX;•<span class="XXXXX-tab-span"> </span>XXX XXXXXXX matter (XXXXXXXXXXXXXXXXX) XXX alter XXXXX and XXXX XXXXXXXXXXXX.<XX><span class="XXXXX-tab-span"> &XX;/span>•&XX;span XXXXX="XXXXX-tab-span"> &XX;/span&XX;XXXXXX mergers XXXXXXXX XXXXXXXXXXXXX XXXXX observable XXXXXX the XXXXXXXX.<XX>observed XXXXXXXX<XX>&XX;span XXXXX="XXXXX-tab-span"> </span&XX;•&XX;span class="apple-tab-span"> &XX;/span>XXXXXXX stars<XX>&XX;span XXXXX="apple-tab-span"> </span>•<span class="XXXXX-tab-span"&XX; </span&XX;XXX b1919+XX: first pulsar XXXXXXXXXX; spins XXXXXXX XXX XXXXX regular XXXXX XXXXXX.<br>&XX;span class="XXXXX-tab-span"> &XX;/span>•<span XXXXX="apple-tab-span"> </span&XX;XX XXXXX.X−XXXX: a nearby, XXXX-XXXXXXX XXXXXXXX neutron star.<XX>&XX;span XXXXX="XXXXX-tab-span"&XX; &XX;/span&XX;•<span XXXXX="apple-tab-span"&XX; </span>XXXXX XXXXX<XX><span class="XXXXX-tab-span"> </span>•&XX;span class="XXXXX-tab-span"> </span&XX;cygnus x-X: XXX of XXX XXXXX XXXXXXXXXX stellar-XXXX XXXXX XXXXX; ~6,000 XXXXX-years XXXX.<br>&XX;span class="XXXXX-tab-span"&XX; </span&XX;•<span XXXXX="apple-tab-span"&XX; &XX;/span&XX;v404 XXXXX: a XXXXXX system with a confirmed black hole; notable for XXXXXXX XXXXXXXXX.</p>">
