Comet Catalina Emerges
Comet Catalina is ready for its close-up. The giant snowball from the outer Solar System, known formally as […]
NASA
A Force from Empty Space: The Casimir Effect
This tiny ball provides evidence that the universe will expand forever. Measuring slightly over one tenth of a […]
Cygnus: Bubble and Crescent
These clouds of gas and dust drift through rich star fields along the plane of our Milky Way […]
Enceladus: Ringside Water World
Saturn’s icy moon Enceladus poses above the gas giant’s icy rings in this Cassini spacecraft image. The dramatic […]
Nebulae in Aurigae
Rich in star clusters and nebulae, the ancient constellation of the Charioteer (Auriga) rides high in northern winter […]
In the Center of Spiral Galaxy NGC 3521
This huge swirling mass of stars, gas, and dust occurs near the center of a nearby spiral galaxy. […]
Dark Sand Cascades on Mars
They might look like trees on Mars, but they’re not. Groups of dark brown streaks have been photographed […]
Rosetta and Comet Outbound
Not a bright comet, 67P/Churyumov-Gerasimenko now sweeps slowly through planet Earth’s predawn skies near the line-up of planets […]
Gravity’s Grin
Albert Einstein’s general theory of relativity, published 100 years ago this month, predicted the phenomenon of gravitational lensing. […]
Planets of the Morning
Planet Earth’s horizon stretches across this recent Solar System group portrait, seen from the southern hemisphere’s Las Campanas […]