  I present a review of how late observations of supernovae, of the nebular
phase, and much later of supernova remnants (SNRs), and their analysis in 2023
made progress towards possible breakthroughs in supporting the jittering jets
explosion mechanism (JJEM) for core-collapse supernovae (CCSNe) and in
introducing the group of lonely white dwarf (WD) scenarios for type Ia
supernovae (SNe Ia). The new analyses of CCSN remnants (CCSNRs) reveal
point-symmetric morphologies in a way unnoticed before in several CCSNRs.
Qualitative comparison to multipolar planetary nebulae that are shaped by jets
suggests that jets exploded these CCSNe, as predicted by the JJEM, but
incompatible with the prediction of the delayed neutrino explosion mechanism.
The spherical morphology of the ejecta Pa 30 of the historical type Iax
supernova (SN Iax) of 1181 AD, which studies in 2023 revealed, is mostly
compatible with the explosion of a lonely WD. Namely, at the explosion time,
there is only a WD, without any close companion, although the WD was formed via
a close binary interaction, i.e., binary merger. Identifying point-symmetry in
SNR G1.9+0.3, a normal SN Ia and the youngest SN in the Galaxy, suggests an SN
explosion of a lonely WD inside a planetary nebula (an SNIP). The group of
lonely WD scenarios includes the core degenerate scenario and the double
degenerate scenario with a merger to explosion delay (MED) time. SN Ia
explosions of lonely WDs are common and might actually account for most (or
even all) normal SNe Ia.
