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27 Cards in this Set
- Front
- Back
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Exoplanet |
A planet outside of our solar system |
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Sun |
The star at the centre of our solar system |
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Star |
A huge ball of gas with nuclear reactions taking place at its core |
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Galaxy |
A system os stars, along with gas and dust, held together by gravity |
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Dwarf planet |
An object which resembles a planet, but does not have a clear orbit around a star |
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Asteroid |
A small, rocky object orbiting a star |
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Solar system |
A collection of planets plus their moons orbiting a star along with asteriods and comets |
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Universe |
All existing matter and space |
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Moon |
A natural satellite |
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Planet |
A large, spherical object which orbits a star, is large enough to be held together by its own gravitational pull and has a clear orbit path |
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The big bang theory |
A theory of how the universe began. States that the entire universe was condensee into an infanitely smal point. During the big bang the universe rapidly expanded. Cooled down which allowed matter, stars, galaxies and everything else to form |
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How old is the universe |
13.8 billion years |
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Red shift |
Galaxies are moving away from us due to the fact that the universe is expanding. As this happens, visible light emmited from these galasies shirt towards the red end of the spectrum, which makes them appear red to us. |
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What is the temperature of the universe |
Around -270°c |
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What does CMB stand for |
Cosmic Microwave Background |
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Cosmic Microwave Background |
Is radiation given off just after the big bang. This has spread evenly throughout the universe |
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What is a light years definition? |
The distance that light travels in one year. |
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What is a light year in meters |
9.4608×10^15m |
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How long does it take light from the shn to reach earth? |
8 mins |
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The whole universe |
Is everything that ever was and ever will be in all of space and time |
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The observable universe |
Is the amount of the universe that we are able to see from earth |
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Weight |
Force exerted on a mass by gravity Is measured in Newtons |
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Mass |
A measure of the quantity of matter in an object Is measured in kilograms |
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Gravity |
Force per unit kass due to gravity Units Nkg-1 |
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Newtons first law |
An object will remain starionary or move in a straight line at a constant speed unless acted on by an unbalanced fource |
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Newtons Second law |
An acceleration is produced when an unbalanced force acts on a mass F=ma |
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Newtons Third law |
Every action has an equal and opposite reaction |
