AQA GCSE: Physics - Space

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24 Terms

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Supernova

A gigantic explosion in which a massive star collapses and throws its outer layers into space

How elements heavier than iron were formed

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Protostar

A contracting cloud of gas and dust; the earliest stage of a star's life

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Nebula

A large cloud of dust and gas in space

<p>A large cloud of dust and gas in space</p>
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Main Sequence Star

A normal star that is undergoing nuclear fusion of hydrogen into helium.

<p>A normal star that is undergoing nuclear fusion of hydrogen into helium.</p>
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Black Hole

An object in space whose gravity is so strong not even light can escape.

<p>An object in space whose gravity is so strong not even light can escape.</p>
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Red Giant

A star that expands and cools once it runs out of hydrogen fuel

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Red Supergiant

Same as red giant, but original star was much more massive

<p>Same as red giant, but original star was much more massive</p>
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Neutron Star

The small, dense remains of a high-mass star after a supernova

<p>The small, dense remains of a high-mass star after a supernova</p>
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White Dwarf

A small, hot, dim star that is the leftover center of an old star

<p>A small, hot, dim star that is the leftover center of an old star</p>
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Black Dwarf

A white dwarf that has burnt out completely.

<p>A white dwarf that has burnt out completely.</p>
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Solar System

The sun with the celestial bodies that revolve around it in its gravitational field

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Comet

Frozen rocks that move around the sun in elliptical orbits

<p>Frozen rocks that move around the sun in elliptical orbits</p>
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Unstable star

When a star has no more hydrogen nuclei to use in fusion

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Meteor

Small bits of rock that burn up upon entering the atmosphere

<p>Small bits of rock that burn up upon entering the atmosphere</p>
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Fusion

Creation of energy by joining the nuclei of two hydrogen atoms to form helium.

<p>Creation of energy by joining the nuclei of two hydrogen atoms to form helium.</p>
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Stable Star

The forces of gravity condensing the star and the force of the radiation expanding the star are balanced

<p>The forces of gravity condensing the star and the force of the radiation expanding the star are balanced</p>
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Uranium

Heaviest known natural element

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Orbit

The path of an object as it revolves around another object in space

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Centripetal Force

A force acting towards the center of an object

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36000 km

Height of Communication Satellites

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Red Shift

The change in the wavelength of light (towards the red end of the spectrum) due to an Star/Galaxy moving away from the observer.

The larger the change, the faster the Star/Galaxy is moving away

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The Big Bang

The theory that the universe began as an infinitesimally small and dense region that exploded suddenly

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Cosmic Microwave Background Radiation

CMBR

High energy gamma radiation created just after the Big Bang that, due to the universe expanding, has been stretched to the wavelength of microwave radiation

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Dark Matter

Matter that does not give off electromagnetic radiation