The cosmos is filled with wonders yet to be discovered. One of the latest mysteries captivating scientists and space ...

Stargazers will be treated to a rare alignment of seven planets on 28 February when Mercury joins six other planets that are already visible in the night sky. Here's why it matters to scientists.

Viewed in this longer context, the previously modern idea of having nine planets, which came about in the 1960s and lasted only until 2006, was a blip on the screen. And if you are still a Pluto ...

Planetary alignments, however, don't have any major physical effect on Earth. "The gravitational forces between the planets, including Earth, are negligible," says van Belle. "The only noteworthy ...