Venus and Mars meet Ganymede and Europa. The choices made in this encounter will change the destiny of the Solar System ...

With a radius of 2,106 miles, Mars is the seventh largest planet in our solar system and about half the diameter of Earth. Its surface gravity is 37.5 percent of Earth’s. Mars rotates on its ...

Saturn is practically a solar system unto itself ... solar panel and robotic arm of NASA's Phoenix Mars Lander. Image was captured from an animation. Right click to download the animation ...

Earth is not alone, and a stunning new animation created using NASA data ... for light to travel from the nearest star to our solar system. Meanwhile, exoplanets are both small and dim, and ...