Astronomy and Space Terms

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Electromagnetic Spectrum

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The range of all types of electromagnetic radiation.

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Main Sequence Stars

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Stars that are in the early stage of their lifecycle, where they spend most of their life.

Most stars in our solar system are classified as this type of star - including our sun.

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Giant Stars

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Stars that have expanded and cooled after using up their core hydrogen.

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Supergiant Stars

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Very large stars that are even larger than giant stars, often in the intermediate stages of stellar evolution.

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White Dwarf Stars

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Small, dense, old stars.

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Luminosity

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The brightness of a celestial object.

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Big Bang Theory

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The leading explanation about how the universe began, proposing it started from a small singularity and expanded over billions of years.

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Universe

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All of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.

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Galaxy

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A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

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Solar System

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The collection of eight planets and their moons in orbit around the sun, together with smaller bodies such as asteroids, meteoroids, and comets.