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"Hot Jupiter: The Planet That Launched a Thousand Exoplanets"
This is your Astronomy Tonight podcast.
On this day in astronomy, August 22nd, we celebrate the anniversary of the discovery of the first exoplanet orbiting a sun-like star. Back in 1996, astronomers Michel Mayor and Didier Queloz announced their groundbreaking find: a planet orbiting the star 51 Pegasi, located about 50 light-years away in the constellation Pegasus.
This planet, later named 51 Pegasi b or "Bellerophon," after the mythical Greek hero who tamed Pegasus, was a game-changer in the field of astronomy. It's a hot Jupiter - a gas giant planet orbiting extremely close to its star, completing an orbit in just 4.2 Earth days.
Imagine standing on the surface of this alien world (if it had a surface, that is). You'd be greeted by a sky dominated by the massive, blazing form of 51 Pegasi, looming so large it would fill a quarter of the sky. The temperature would be a toasty 1000°C, hot enough to melt lead. You might see metallic clouds raining molten iron, and experience winds whipping at supersonic speeds. It's like Jupiter decided to take a vacation right next to the Sun!
This discovery opened the floodgates for exoplanet hunting. Since then, we've found thousands of planets beyond our solar system, ranging from tiny rocky worlds to enormous gas giants, and even some potentially habitable planets. 51 Pegasi b showed us that planetary systems could be wildly different from our own, sparking a revolution in our understanding of planet formation and the potential for life in the universe.
So tonight, when you look up at the summer sky, give a little nod to the constellation Pegasus. Hidden in its stars is the planet that started it all, still zipping around its star every four days, oblivious to its role in astronomical history.
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Published on 2 days, 23 hours ago