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Glossary

This page is meant to make it easier for you to understand the content of this web site. The glossary contains both astronomical and art terms.


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Infrared radiation: Radiation with a shorter wavelength than to humans visible light. Cold objects radiate infrared radiation. This kind of light is best observed above the atmosphere, because the atmosphere absorbs it.
Astronomers study objects through this 'window' of light when visible light is obscured by intermediate stellar dust. The center of the milky way galaxy is studied through infrared. Link: Fusion processes and radiation.

Internal pressure: This force is gravity's counterpart in a star. The gravity strives to compress the star, while the internal pressure strives to expand the star. Internal pressure is essential for a star to remain in equilibrium (stability). Link: Stellar interiors.

Interstellar dust: Dust that is found between the stars in a galaxy,
Link: nebulae.

Interstellar medium: The space between stars in a galaxy.

Ion: An atom that is electrically charged. There is an abundance, or a shortage of electrons in the atom's layers. Link: Fusion processes and radiation.

Ion tail: The straight tail of a comet which is generated by particles from the solar wind.

Irregular galaxy: A galaxy type that doesnt have a characteristic shape. Irregular galaxies are usually small, and contain 100 million to 10 billion stars. Sometimes when galaxies collide, the result is an irregular galaxy.







 




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