The origin of carbon: Low-mass stars and an evolving, initially top-heavy IMF?
The origin of large peculiar motions of star-forming regions and spiral structures of our Galaxy
The Origin of OB Runaway Stars
The Origin of Parsec-Scale Gaseous and Stellar Disks in the Galactic Center and AGNs
The origin of RXJ1856.5-3754 and RXJ0720.4-3125 -- updated using new parallax measurements
The origin of S-stars and a young stellar disk: distribution of debris stars of a sinking star cluster
The Origin of Segue 1
The origin of the Guitar pulsar
The Origin of the Hot Gas in the Galactic Halo: Confronting Models with XMM-Newton Observations
The Origin of the Silicate Emission Features in the Seyfert 2 Galaxy, NGC 2110
The origin of the [C II] emission in the S140 PDRs - new insights from HIFI
The origin of very wide binary systems
The Outer Disk of the Milky Way Seen in 21-cm Absorption
The outer halos of elliptical galaxies
The Outer Shock of the Oxygen-Rich Supernova Remnant G292.0+1.8: Evidence for the Interaction with the Stellar Winds from its Massive Progenitor
The Oxygen Abundance in the Solar Neighborhood
The oxygen vs. sodium (anti)correlation(s) in omega Cen
The PAH hypothesis after 25 years
The Parker instability in axisymmetric filaments: Final equilibria with longitudinal magnetic field
The past, present and future of Galactic planetary nebula surveys