Ah, October 20th! A date that shines brightly in the annals of astronomical history. Let me regale you with a tale of cosmic proportions that occurred on this very day in 1995.

On October 20, 1995, astronomers Michel Mayor and Didier Queloz of the University of Geneva made an announcement that would forever change our understanding of the universe. They had discovered the first planet orbiting a sun-like star outside our solar system!

This exoplanet, dubbed 51 Pegasi b, was found orbiting the star 51 Pegasi, about 50 light-years away from Earth in the constellation Pegasus. But this wasn't just any planet - oh no! 51 Pegasi b was a real oddball, defying all expectations and throwing our theories of planetary formation into disarray.

Picture this: a planet about half the mass of Jupiter, but orbiting its star every 4.2 Earth days! That's right, its year is shorter than your average work week. It's so close to its star that its surface temperature is estimated to be a toasty 1000°C (1832°F). Talk about a hot vacation spot!

This discovery kicked off the exoplanet revolution. Before 51 Pegasi b, we only knew of the planets in our own solar system. Now, as of 2024, we've confirmed thousands of exoplanets, with many more candidates waiting to be verified.

The find was so significant that Mayor and Queloz were awarded the Nobel Prize in Physics in 2019 for their work. It's like they won the cosmic lottery!

So next time you're stargazing on October 20th, give a little nod to 51 Pegasi b. It might be too far away to see, but this hot Jupiter opened our eyes to a universe teeming with alien worlds, each one stranger and more wonderful than the last. Who knows what other planetary oddities are out there, waiting to be discovered?