Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

Because planets always appear in a line, the alignment isn't anything out of the norm. What's less common is seeing so many ...

Alignments of five or more planets are rare—there will be two more featuring five or more planets this year, but after that ...

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.

A rare parade of planets will light up the night sky throughout January. Six planets will be in alignment for the rest of the ...