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If we see a nebula by looking through a powerful telescope, how can we tell whether we are looking at the remnant of a supernova or at a planetary nebula? Thanks

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  • $\begingroup$ This article seems to explain it but there is a paywall unfortunately. $\endgroup$ Nov 25, 2017 at 20:21

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A Supernova Remnant contains a Black Hole or a Neutron Star while a Planetary Nebula contains a White Dwarf.

Also, Supernovae Remnants are likely to have great velocities, so Doppler is another plausible choice. - Not through telescope though.

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