The relative size of the inner planets of our solar system: Mercury, Venus, Earth and Mars. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert!

A European-Japanese spacecraft has beamed back some of the best close-up photos yet of Mercury's north pole as part of only the second human survey of our solar system's innermost planet.

New images of the planet Mercury taken by a robotic spacecraft have just been released — and they show the scorched world in fascinating up-close detail. SEE ALSO: Is Mercury in retrograde?

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

Earth's atmosphere pulses in sync with the sun's fiery outbursts, indicating it is more sensitive to solar activity than previously thought, according to new research.

Saturn is practically a solar system unto itself. Pluto may not count as a planet anymore ... larger version of this image. Cornell University This image of a crescent Mercury was taken by ...

But what’s it like on other planets? There are eight planets in our solar system ... to send images back to Earth. This allows us to compare the planets in even more detail. Mercury and Venus ...