What are the possible remnants of supernovae?
protostars or nebulae
neutron stars or black holes
white dwarfs or protostars
black dwarfs or white dwarfs
Supernovae occur during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.  Supernovae may expel much, if not all, of the material away from a star. However, if the explosion is weak enough,  the star may collapse into a black hole or neutron star with little radiated energy.
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Answers by country
protostars or nebulae
neutron stars or black holes
white dwarfs or protostars
black dwarfs or white dwarfs
answers
Estonia15
the Philippines31
the United States204
Unknown17
Pakistan36
Austria84
Australia38
Canada26
the Netherlands24
India421
France18
Ghana13
Malaysia12
the United Kingdom110
Germany433
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Switzerland37
Nigeria22
Poland4257
Republic of Ireland22