What is the Smallest Planet in Our Solar System? Mercury Facts! (2025)

Did you know that the title of the smallest planet in our Solar System is a topic that sparks both curiosity and debate? But here's where it gets controversial... While many might assume it’s Mercury, the answer isn’t as straightforward as it seems—especially when considering the history of planetary classification. Let’s dive in!

Mercury, the closest planet to the Sun, holds the crown for being the smallest of the eight planets, with a diameter of just 4,879 kilometers. But this wasn’t always a clear-cut fact. And this is the part most people miss... Before 2006, Pluto was considered the smallest planet, but a controversial decision by the International Astronomical Union (IAU) reclassified it as a dwarf planet, leaving Mercury as the undisputed smallest. This move still divides astronomers and space enthusiasts alike—was it a fair call, or did Pluto get a raw deal? Let us know your thoughts in the comments!

Now, while we’re on the topic of planetary trivia, here’s a fun challenge for you: The Chase Australia’s official Shark, Brydon Coverdale, has launched a daily quiz that’s sure to test your knowledge. Ready to put your brain to the test? SUBSCRIBE now and join the fun!

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So, whether you’re a space enthusiast debating Pluto’s status or just looking for a great deal on unlimited news, there’s something here for everyone. What’s your take on Pluto’s reclassification? Let the debate begin!

What is the Smallest Planet in Our Solar System? Mercury Facts! (2025)

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