Astronomy Glossary

Explore 128 astronomical terms with clear definitions and real-world examples

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26

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H

HR Diagram

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Astronomy Concepts

The Hertzsprung-Russell diagram plots stars' luminosity (or absolute magnitude) vs temperature (or spectral type/color), revealing stellar populations...

Heliosphere

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Solar System

The heliosphere is the vast bubble of solar wind and magnetic field surrounding the Solar System, separating it from interstellar space.

Hubble Space Telescope

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Telescopes Equipment

A space telescope launched in 1990.

Hubble's Law

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Cosmology Universe

Hubble's Law states that galaxies' recession velocities are proportional to their distances: v = H₀ × d.

Hypernova

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Stellar Objects

A hypernova is an exceptionally energetic supernova (10-100× normal), producing relativistic jets and associated with long-duration gamma-ray bursts.