How far away are the stars?

The stars are not all at the same distance from us. Some stars are closer and some are farther away. The closer a star is to us, the brighter it will appear. Also, stars come in a variety of sizes and brightnesses. Larger stars usually shine more brightly than smaller stars do. So, how bright a star appears in the night sky depends on its size as well as how far away from us it is. The closest star is about 25,300,000,000,000 miles (39,900,000,000,000 kilometers) away, while the farthest stars are billions of times farther than that.


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Learn about IRAS, the first infrared telescope launched into Earth's orbit!