The cat is defined as being in estrus, in heat or in season (i.e. likely to become pregnant if mated) if it shows behavioral characteristics that are typical of a female cat in heat and if it stands for the male cat and allows mating to occur (i.e. is receptive to mating).he feline estrus cycle, otherwise known as the female reproductive cycle or heat cycle of the female cat, is a repetitive cycle of seasonally and hormonally driven fluctuations in a female cat's fertility and sexual receptivity.
Type Ib/c and II-L, and possibly most Type IIn, supernovae are only thought to be produced from stars having near-solar metallicity levels that result in high mass loss from massive stars, hence they are less common in older, more-distant galaxies.
Above 8 solar masses, they explode as supernovae. Between 8 and 15 solar masses the remnant of the explosion ends up as a neutron star; above about 15 solar mass, the remnant collapses catastrophically to become a black hole To clarify the Type 1a vs Type 2 supernovae-massive stars end up as type 2 supernovae.eport Abuse. A small star will go nova, leaving behind a small dwarf star, usually a white dwarf. A very large star will go supernova, and could possibly leave behind a neutron star or a black hole.