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!

April’s planetary parade has fewer planets. Only four will line up: Venus, Saturn, Mercury and Neptune. April's parade of ...

Watchmakers and astronomers worked together to create orreries: mechanical contraptions that illustrate the positions of all planets and ... mounted model of our Solar System without a gearing ...

Watch this video to find out more about the Earth, planets in our Solar System and other planets far off in outer space. From up here on the International Space Station I get a great view of Earth.

These celestial gatherings offer breathtaking sights and remind us of the vast, interconnected workings of our solar ... depend on the relative positions of the Earth and the planets in their ...

we now have a good understanding of our Solar System. From the one with the ears, to the 11 year old girl that gave one of them their name, here are the stories behind each of the planets within it.

The alignment takes place over time as each planet in the solar system orbits the sun at its own speed and distance, continually changing their relative positions ... other planets in our solar ...