This oblique view of Houston, Texas, was taken from the International Space Station as it orbited above northern Louisiana.
A new chronology for the moons of Saturn has been developed by Planetary Science Institute Associate Research Scientist Samuel W. Bell.
Jupiter's volcanically active moon Io casts its shadow on the planet in this dramatic image from NASA's Juno spacecraft.
A small near-Earth asteroid (or NEA) will briefly visit Earth's neighborhood on Thursday, Sept. 24, zooming past at a distance of about 13,000 miles (22,000 kilometers) above our planet's surface.
In a delightful alignment of astronomy and mathematics, scientists at MIT and elsewhere have discovered a "pi Earth" -- an Earth-sized planet that zips around its star every 3.14 days, in an orbit reminiscent of the universal mathematics constant.