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How big is Halley's Comet?

11 kilometers!

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Halley's Comet

Introduction Have you ever looked up at the night sky and wondered what you're seeing? Stars, planets, and once in a while, a special visitor like Halley's Comet. Named after the English astronomer Edmond Halley, this short-period comet swings by our Earth every 75-79 years. It's the only comet we can see with the naked eye that can appear twice in a human lifetime. But just how big is this celestial wanderer?

## How big is Halley's Comet? Imagine a peanut. Now, imagine that peanut being about 9 miles (15 kilometers) long. That's roughly the size of Halley's Comet! To put it in perspective, it's about the same size as the city of Manhattan in New York. So, while it might seem tiny against the vast backdrop of space, it's actually quite large when you compare it to things we're familiar with on Earth. ## Size Comparison

  • Halley's Comet is about half the size of Mount Everest, the highest peak on Earth, which is approximately 18 miles (29 kilometers) from base to summit. - The comet is about the same length as 158 Eiffel Towers stacked end to end. The Eiffel Tower is about 330 meters tall. - The comet is almost twice as long as the Grand Canyon which is approximately 5 miles (8 kilometers) wide.

What makes up Halley's Comet? Halley's Comet is made up of a mixture of ices such as water, carbon dioxide, and some rocky material. This mixture is often referred to as a "dirty snowball". The center or nucleus of the comet, which is the part that is about 9 miles long, is covered in a dark, sooty substance. This is what we see when we observe the comet from Earth.

## Halley's Comet in History and Culture Halley's Comet has been recorded by astronomers from all around the world since at least 240 BC. However, it wasn't until 1705 that Edmond Halley realized that this comet was the same one reappearing over time. Since then, the comet has become a symbol of predictability and the beauty of the cosmos. It has even found its way into popular culture, featuring in songs, movies, and even video games!

The Next Appearance The last time Halley's Comet visited us was in 1986, and it's expected to make its next appearance in mid-2061. So, if you missed it the last time, don't worry! You might just get a chance to see this 9-mile-long "dirty snowball" as it streaks across the night sky in the future.

In conclusion, Halley's Comet may not be the biggest object in our solar system, but its size is still impressive when compared to familiar landmarks on Earth. It's a fascinating reminder of the wonders that exist beyond our planet, waiting to be discovered and explored.

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