Two types of Lyman-alpha emitters envisaged from hierarchical galaxy formation
Two Types of Magnetohydrodynamic Sheath Jets
Two types of pulsar
Two types of pulsar?
Two types of pulsars
Two Types of Radio Galaxies: A New Approach
Two types of shock in the hotspot of the giant quasar 4C74.26: a high-resolution comparison from Chandra, Gemini & MERLIN
Two types of slow solar wind
Two types of softening detected in X-ray afterglows of Swift bursts: internal and external shock origins?
Two Types of X-ray Spectra in Cataclysmic Variables
Two UBV photoelectric sequences in Cygnus
Two ultramassive white dwarfs found among candidates for magnetic fields
Two universes
Two Upper Limits on the Rossiter-McLaughlin Effect, with Differing Implications: WASP-1 has a High Obliquity and WASP-2 is Indeterminate
Two variable compact galaxies
Two variable radio sources near the position of GRB 940301.
Two very nearby (d ~ 5 pc) ultracool brown dwarfs detected by their large proper motions from WISE, 2MASS, and SDSS data
Two very similar closely detached binary systems - AT and AZ Camelopardalis
Two viable quintessence models of the Universe: confrontation of theoretical predictions with observational data
Two views of globular cluster stars in the Galactic halo