Stargazers will be treated to a dazzling six-planet "alignment" this January.

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

The last time all solar system planets aligned was on April 8, during the total solar eclipse. During the next full alignment ...

The last time all the planets lined up this way was in April last year ... seven planets will appear in the sky at once in a large alignment, starting January 21. Any number of planets, ranging ...