Space science

Explore astronomy, NASA missions, planets, galaxies, the Moon, the Solar System and discoveries that expand our understanding of the universe.

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Articles & explainers

8,698 published items in this category and its subcategories.

What Makes an Exoplanet Potentially Habitable?
Space science

What Makes an Exoplanet Potentially Habitable?

A potentially habitable exoplanet is a world where known conditions could allow environments suitable for life as we understand it; being in a star’s habitable zone is o…

September 11, 2026
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
The latest images of galaxies spiraling together.
Space science

The latest images of galaxies spiraling together.

The Gemini North telescope, located atop Maunakea in Hawaii, USA, has discovered interacting spiral galaxies approximately 60 million light-years away in the constellati…

March 4, 2026
Learn about the star Sirius.
Space science

Learn about the star Sirius.

Sirius is the brightest star in the night sky with an apparent magnitude of -1.47, nearly twice as bright as Canopus, the second brightest star.

March 1, 2026