The Whirlpool Galaxy, also known as Messier 51 (M51) or NGC 5194, is a classic spiral galaxy located in the constellation Canes Venatici. It is one of the most famous galaxies in the night sky and is often observed and studied by astronomers and amateur stargazers alike.

Here are some key details about the Whirlpool Galaxy:

1. Location: The Whirlpool Galaxy is situated approximately 23 million light-years away from Earth.
2. Structure: It is a grand-design spiral galaxy, meaning it has well-defined spiral arms. The spiral arms of the Whirlpool Galaxy are prominently seen in images, resembling a swirling pattern, hence its name.
3. Interaction with NGC 5195: The Whirlpool Galaxy is often observed in conjunction with its companion galaxy, NGC 5195. NGC 5195 is a smaller galaxy that is interacting with M51, and their gravitational interactions have influenced the structure of both galaxies.
4. Observations: The Whirlpool Galaxy is a popular target for telescopic observations due to its bright core and distinct spiral arms. It was first discovered by Charles Messier in 1773, and its status as a pair with NGC 5195 was later recognized.
5. Messier Catalog: Charles Messier included the Whirlpool Galaxy in his catalog of non-stellar objects, known as the Messier Catalog. The Messier Catalog was created to help astronomers distinguish between permanent and transient celestial objects, such as comets.
6. Hubble Space Telescope Image: The Whirlpool Galaxy has been imaged by various telescopes, including the Hubble Space Telescope, producing stunning high-resolution images that reveal intricate details of its spiral structure and the interaction with NGC 5195.

Observing the Whirlpool Galaxy is a treat for astronomers and astrophotographers, and it serves as an excellent example of a spiral galaxy in our cosmic neighborhood.