Ugh. It took me an hour and a half to do that lab. I'm certainly getting my designated four hours a week out of it this semester. (Or is it four hours a session three times a week? No... I think that's just the 'time budgeting' formula.)
I should try to do the discussion questions now.
Conclusion for Lab 25
"Visible features of a supernova remnant can include ring or wave-like patterns from where the matter was ejected from the core. Pink/red patterns represent where the outer layer of hydrogen was ejected. Some of the patterns are symmetrical around the center, some are symmetrical to each other.
"Pulsars are neutron stars left behind in a supernova explosion. (It isn't known whether all neutron stars are pulsars, though.) They appear to pulse when one of the "beams" of radiation from the magnetic poles crosses the Earth.
"In order for a supernova explosion to occur instead of a planetary nebula, the star must have a mass equivalent to at least 8 Suns. Average stars like our Sun become red giants, then shrinks when helium burning begins, then expands to become a red giant again when helium in the core is exhausted and hydrogen/helium shell burning occurs. It eventually expels its outer layers to become a planetary nebula and the cooling core left behind is a white dwarf. Very massive stars first become Cepheid variables then red supergiants. They also shrink when helium burning begins then again become red supergiants as other elements in the core fuse, run out, and start burning in a shell around the core. When the core becomes oron it collapses and the outer layers bounce off it, causing a supernova explosion. The core will collapse to become all neutrons and thus a neutron star, unless it is more massive than three Suns, in which case it becomes a black hole."
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