Recent evidence of quasars contradicts popular theory of black holes in favor of MECOs (Magnetospheric Eternally Collapsing Objects), as black holes cannot have magnetic fields. This article from New Scientist gives a summary.
A false-color mosaic picture from the Mars Odyssey orbiter of the Melas Chasma, which is being considered as a landing site for the Mars Science Laboratory rover.
The Wikipedia entry on magnetospheric eternally collapsing objects, the theoretical alternative to black holes. A concise, fairly readable overview of the concept.