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**A Closer Look at Our Cosmic Neighbour: The Charming Spiral M100**
Within the bustling Virgo Cluster of galaxies, you'll find the delightful and well-ordered M100 galaxy. It's a spiral beauty that stretches across space with a breadth of roughly 100,000 light-years, similar to taking a leisurely stroll across the universe's grand boulevards.

**How M100 Waved Hello to Us**
This spiral charmer was first spotted by Pierre Méchain, a French astronomer with a penchant for comet hunting, back in 1781. Not wanting to leave such a fascinating discovery alone in the cosmos, Charles Messier, Méchain's compatriot and fellow sky surveyor, included it in his famous cosmic collection, hence its moniker—M100 in the Messier Catalogue.

**M100's Cosmopolitan Neighbourhood**
About 55 million light-years from Earth, M100 isn't exactly what you'd call next door. But in the scale of the universe, it's like a neighbour in the outer suburbs of our Local Group. The Virgo Cluster, where M100 resides, is a sort of grand metropolis of over 1,300 galaxies, all swirling together in a gravitational waltz.
Among M100's intriguing galactic companions is NGC 4321, sharing a zip code in the Virgo Cluster and flaunting its cosmic swirls just like M100. There's also the famous M87, which made headlines for its supermassive black hole—yes, the one with that stunning photo that went viral across the astronomical community in 2019.

**Figuring Out the Cosmic Tape Measure**
When it comes to measuring just how far M100 is, astronomers turn to Cepheid variable stars. These trustworthy stars blink with a reliable rhythm, and by measuring their pulse, we can tell how bright they truly are, and hence, how far away M100 is from us. Another cool trick is looking at redshift, which tells us how much the galaxy's light has stretched as the universe itself expands, offering another clue to M100's distance.

**Why M100 Matters**
Studying M100 doesn't just feed our curiosity about a distant galaxy It actually helps us understand our own galactic home better—the Milky Way. By learning about M100's spirals, we're unfurling the secrets of the universe's structure, its past, and where we all fit in the grand cosmic picture. So next time you look up at the night sky, give a little nod to M100, our graceful spiral acquaintance twirling through space.