Planetary alignments aren't rare, but they can be when they involve six of the eight planets in our solar system.

The six planets were visible in the days immediately leading up to Jan. 21, and for about four weeks afterward. Mars, Venus, ...

"A parade of planets, also sometimes referred to as a planetary alignment, is when several planets in our solar system appear to line up in the sky from our perspective here on Earth," John Conafay, ...

In the depth of winter, a sweeping view of our solar system will glow in the night sky. In total six planets will be visible, ...

A parade of planets will be visible to skywatchers around the globe through the rest of this month and into February.

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...