Saturn, with its alluring rings and numerous moons, has long fascinated stargazers and scientists. After an initial flyby of Pioneer 11 in 1979, humanity got a second, much closer look at this complex planetary system in the early 1980s through the eyes of NASA's twin Voyager spacecraft.
Astronomers using observations from NASA's WISE and Fermi missions have confirmed a connection between the infrared and gamma-ray light emitted by blazars, a class of distant galaxies powered by monster black holes.
Researchers have discovered four of the most distant clusters of galaxies ever found, as they appeared when the universe was only 4 billion years old. This sample is now providing the best measurement yet of when and how fast galaxy clusters stop forming stars in the early universe.
This is an illustration of warbler. For decades, conservationists have considered blue-winged warblers to be a threat to golden-winged warblers, a species being considered for federal Endangered Species protection. Blue-winged warbler populations have declined 66 percent since 1968, according to the North American Breeding Bird Survey.
This is a fossil ptilodactyline beetle found in amber from Mexico. The black arrow points to pollinia attached to the beetle's mouthparts. When most people hear the word "pollinator," they think of bees and butterflies. However, certain beetles are known to pollinate plants as well, and new fossil evidence indicates that they were doing so 20 million years ago.
Squinting won't help you spot the fish in this photo. These snub-nosed darts blend seamlessly into their watery surroundings with help from their silvery reflective skin. In a matchup of animal superpowers, a clever form of camouflage might beat super sight -- at least in the ocean.
A single thymic epithelial cell (red) in contact with developing T cells (white). Researchers at the universities of Basel and Oxford have for the first time identified all genes regulated by the protein Foxn1. The results show that Foxn1 not only plays a crucial role in development of the thymus in the embryo, but it also regulates vital functions in the developed, postnatal organ. The decryption of the protein's functions is important in the understanding and treatment of autoimmune diseases, vaccination responses in old age and defense against tumor cells. The study was published in the journal Nature Immunology.