When a Star Undergoes a Nova Explosion, It May Return

question 25

Multiple Choice

When a star undergoes a nova explosion, it may return to its "quiet state" and later become a nova again. What would allow a nova explosion to happen to a star more than once?

• A) the star that goes nova collides with several stars in a star cluster
• B) the star that goes nova has a companion star near it, which dumps material onto the first star and continues to do so even after the first nova explosion
• C) the star that goes nova has a number of massive planets around it which fall in
• D) the star that goes nova has an iron catastrophe in its core and then another step in the fusion of heavy elements producer another explosion
• E) a nova explosion happens each time a neutron star rotates to face us, and that happens every century or so

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