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On October 6th, 1995, astronomers Michel Mayor and Didier Queloz made an announcement that would forever change our understanding of the universe. They had discovered the first exoplanet orbiting a sun-like star! This groundbreaking find was 51 Pegasi b, a hot Jupiter located about 50 light-years away in the constellation Pegasus.

Imagine, if you will, a massive gas giant, about half the mass of Jupiter, but so close to its star that it completes an orbit in just 4.2 Earth days! This planet is so toasty that it's thought to have a surface temperature of around 1,000 degrees Celsius. That's hot enough to melt lead, folks!

The discovery of 51 Pegasi b opened the floodgates for exoplanet research. Before this, we could only speculate about worlds beyond our solar system. Now, we know of thousands! It's like we were living in a house, thinking we were alone, and suddenly realized there's an entire neighborhood out there.

This find also challenged our theories about planetary formation. We thought gas giants could only form far from their stars, but 51 Pegasi b showed us that these planets can migrate inwards, leading to the "hot Jupiter" category.

So next time you look up at the night sky, remember that 28 years ago on this day, our cosmic perspective shifted dramatically. We're not alone in the galaxy – far from it! And who knows what other incredible discoveries await us in the vast expanse of space?

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