<h5>A Visitor From Far Away</h5><p>NASA has shared new pictures of a rare object called Comet 3I/ATLAS. It entered our solar system after travelling through space for billions of years.</p><p>Scientists first saw it in July 2025, and it was moving very fast, at around 220,000 kilometres per hour.</p><p>Big telescopes like Hubble and the James Webb Space Telescope took clear pictures of it.</p><h5>What Are Comets?</h5><p>A comet is basically a big icy ball made of frozen gas, dust, and rock.</p><p>Most comets were made 4.5 billion years ago, when our solar system was very young. They come from places far away, such as the Kuiper Belt or the Oort Cloud, which can be almost one trillion kilometres from the Sun.</p><p>When a comet gets close to a star, the heat melts its ice into gas. This makes a glowing cloud around it called the coma. The coma can become hundreds of thousands of kilometres tall.</p><p>Sunlight also pushes dust and gas behind the comet and creates long tails that always point away from the Sun.</p><h5>About 3I/ATLAS</h5><p>Comet 3I/ATLAS is special because it did not come from our solar system. It came from another star system in the Milky Way.</p><p>Scientists know this because its path is shaped like a hyperbola. This means the comet will pass by once and then leave the solar system forever.</p><p>ATLAS also has unusual chemicals. Telescopes found that it has a lot more carbon dioxide than normal comets. It also shows signs of nickel gas, which is very rare.</p><p>This tells scientists that ATLAS was made in a very different place. It may even be older than our solar system!</p><h5>Why Is It Important?</h5><p>Studying ATLAS helps scientists learn about other solar systems. It is like a tiny piece of a faraway world coming close enough for us to study.</p><p>By comparing ATLAS to comets in our own solar system, scientists understand how planets form in different parts of the galaxy.</p><p>ATLAS is also completely safe for our planet. NASA says it will stay around 275 million kilometres away from Earth.</p><p>People with strong telescopes might see it as a small dot in December 2025, but it cannot be seen with the naked eye.</p><h5>A One-Time Guest</h5><p>Comet 3I/ATLAS will pass through our solar system only once. After that, it will travel far back into the galaxy. NASA will keep watching it until it becomes too far away.</p><p>The comet reminds us that our solar system is just a small part of a very big universe. Visitors like ATLAS help us learn more about space and show how much more there is to discover.</p>

A rare interstellar comet, 3I/ATLAS, is passing through our solar system at incredible speed, giving scientists a brief chance to study a visitor from another star.

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