Watching hummingbirds in a slow motion video has turned up new insights into their behavior - like how males use their tail feathers to "sing" to females.
Solar wind sandblasts Mercury because its weak magnetic field provides little protection from the fierce solar wind, a squall of charged particles from the sun.
Study shows how two highly intelligent bird species, parrots and crows, use native talents to inform their decisions. Read more about these smart birds.
Astrophysicists have scrutinized X-rays from accretion disks surrounding eight black holes and confirmed differences between black hole observation and theory.
The Chilean volcanic eruption on Saturday, June 4, 2011 reached six miles up into the sky and sent a plume of ash toward Argentina. Read more about falling ash.