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Stars are powered by nuclear fusion in their cores. Explore a diverse set of stellar properties, including the star type and end state, using Wolfram|Alpha. A star that fuses hydrogen in its core is known as a main sequence star, but as stars age and run out of hydrogen in their core, they begin to evolve into subgiants, giants and possibly supergiant stars. The primary determining factor for how a star evolves and eventually ends its life is its mass. Low-mass stars typically end their lives as white dwarf stars after becoming giants. More massive stars can end their lives as neutron stars or black holes after undergoing a supernova explosion.


Identify stars based on various catalogs they appear in. Bright stars have common names, but many stars only have catalog identifiers.

Compute the location and get properties of a star:

Specify a star using a Bayer name:

Specify a star using a catalog number:

Compare several stars:

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Properties of Stars

Obtain a diverse set of properties for stars, such as luminosity, mass and radius, as well as position-based properties.

Request a property of a star:

Compute the color of a star:

Compare properties of multiple stars:

Do computations with star properties:

Generate a list of nearby stars:

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Stellar Classification

Decode many different pieces of information about a star including temperature, radius and mass, as well as chemical peculiarities, which are encoded in the spectral class of a star.

Get information about a spectral class of stars:

Find the spectral class of a given star:

Generate a Hertzsprung–Russell diagram:

Determine the end state of a star:

Get information about a star with a given property:

Specify a property and luminosity class:

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Constellations are apparent patterns of stars as seen from Earth. Explore all 88 officially recognized constellations, each having a recognized boundary in the sky.

Generate a star chart for a constellation:

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