Models of accretion disk spectra show that warped and broken disks do not radiate like the multicolor blackbodies used to model accreting stellar-mass black holes, unless the disks break at large radii.

Researchers have shown that the bright knots of gas from the red hypergiant star VY CMa amount to 0.02 solar mass of gas ejected 200 years ago in an active period lasting 30 years.

Long-term observations of the pulsar PSR B1310+18A reveal it to be 700–850 million years old, with a helium white dwarf companion weighing 0.39 solar mass.

Observations of a supernova taken 18 and 22 years after the explosion was initially detected suggest that the supernova’s forward shock has broken through any circumstellar shell or torus that was present.

A collapsing star can evolve into a black hole while still generating a supernova, and simulations have explored the energies of these explosions and the ejecta they spread through the interstellar medium.

A survey of massive stars in the Small Magellanic Cloud, one of the Milky Way’s satellite galaxies, suggests that the small galaxy is being tidally stretched by another satellite, the Large Magellanic Cloud.