Astronomer

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Articles about Astronomer

967 published items.

What Are Exoplanets?
Space science

What Are Exoplanets?

Exoplanets are planets beyond our solar system. They range from small rocky worlds to giant planets and can orbit stars very different from the Sun.

September 10, 2026
How Do Astronomers Detect Exoplanets?
Space science

How Do Astronomers Detect Exoplanets?

Astronomers usually detect exoplanets indirectly, by measuring how a planet changes the light, motion, or gravitational behavior of its host star.

September 10, 2026
How many planets are there in the universe?
Space science

How many planets are there in the universe?

Astronomers estimate there are about 100,000 trillion billion planets in the universe based on the assumption that every star has a planet orbiting it.

September 15, 2025