The other three that wear blankets of gas are Venus, Mars, and our own Earth. Why just these four? Why not also, say, Mercury ... their stony bodies. The CO 2 and H 2 O came from two sources ...

How can we successfully collect and return samples from Mercury and Venus to Earth? This is what a recent study presented at the 56th Lunar and Planetary Science Conference hopes to address as a pair ...

After a six-planet alignment in January, Mercury’s arrival completes the ... sky is more than a spectacle—it’s a reminder that Earth is just one part of a vast, interconnected cosmic system.

Mercury, Venus, Mars, Jupiter, Saturn ... The planets in the solar system orbit the sun, just as Earth does. Every planet ...

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!