Nino Panagia

1- Novae & Supernovae: HST observations of SN 1987A, and other SNe; Radio studies of supernovae; HST observations of Nova Cygni 1992. 2- Stellar Winds: Theory of the continuum and line formation in ionized winds; H-a line and radio cont. studies of early type supergiants. 3- Interstellar Medium: Early evolution of Planetary Nebulae (PNe); Luminosity function of PNe in a variety of environments; HST study of PN internal structure and expansion. 4- Stellar Population: Local Group (LMC & SMC); Partially resolved populations (M81, M51, M100); Unresolved populations (NGC 454). 5- Galaxies: Study of the abundance and ionization gradients in late type galaxies; Metallicities and ages of high-z galaxies. 6- Cosmology: Cepheid distances to SNIa host galaxies; Cosmic distance scale (SNIa determination of H₀); SNIa determination of $\Omega$ and $\Lambda$; SN rates in the Universe.