Striking images of a rare planetary alignment of Venus and Mars were shared on social media this weekend, as the pair hovered in the post-sunset dusk sky.

According to the National Aeronautics and Space Administration, the two planets have not been this close since 2008. The pairing is known as a conjunction, and could be observed from the western horizon for three days, from Feb. 19 to Feb. 21.

NASA says Venus, a planet that is only a little smaller than the Earth in size, was the brighter of the two planets.

Stargazers who looked up could also see a crescent moon, making for an impressive show.

Images of the planetary conjunction were shared on social media over the weekend.