A glance at the night sky above Earth shows that some stars are much brighter than others. However, the brightness of a star depends on its composition and how far it is from the planet. Astronomers ...

Bright sky threat: Upcoming ultrabright satellite constellations could triple night sky brightness, severely impacting astronomical observations. Scientific impact: Models show bright satellites can ...

One of the first concepts the novice backyard astronomer needs to grasp is the idea of magnitude. The magnitude of a star defines its brightness and, therefore, its visibility. It’s easy to understand ...

If someone asks you, “How bright is that star?” and your answer is “Pretty bright,” that isn’t very useful. And, of course, it’s worthless for any type of comparative research. So for centuries, ...

Learn about the brightest star in the solar system and the night sky. Discover facts about the Sun, Sirius, and how astronomers measure stellar brightness.

Often in these weekly Night Sky columns I refer to the magnitude of a star or planet. The concept of magnitude is relatively easy to grasp. Put simply, magnitude indicates an object’s degree of ...

There are more than 12,000 active satellites circling Earth at the moment, a growing figure that has nearly doubled in less than three years. This recent boom in the satellite industry has been a ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Oftentimes in skywatching stories, astronomers refer to the magnitude of a star or planet. It's ...

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