Space exploration and travel
Space salt, Martian clay, and unexpected X-rays feature in this month's slideshow.
Scientists are trying to perfect a technique for growing crops in space so that astronauts have enough food to get to Mars and back.
An assortment of twinkling images of space, stars and spacecrafts.
View new pictures of Mars, the last picture of the dwarf planet Ceres and images of the brightest galaxy in the universe.
A team of engineers spent years giving new life to old NASA tapes.
Enjoy illustrations of pulsar winds, the planet Vulcan and galactic ripples.
Food scientists are developing food for astronauts that stays nutritious and fresh for at least three years.
As summer winds down, savor images from some of the hottest, most magnetic, and awe-inspiring places in the universe.
A new study suggests also looking for "bioessential" elements when searching for alien life.