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| a solid rock that can be anything from about 10 to 500km across. |
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| The gases surrounding a planet. |
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| One of the theories of how the universe came into existance and time began. |
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| An object with such strong gravity that it prevents the escape of light. |
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| A ball of ice and dust that goes around the sun in an eccentric orbit. |
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| Material which is very difficult to detect in space. |
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| The area in which a mass experiences a force. |
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| The area of space in which the effects of planets are negligable. |
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| A measure of how much of something there is. Measured in kg. |
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| A naturally formed object which orbits a planet. |
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| A collection of gas in space usually hydrogen. |
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| Sugests the creation of the universe followed the death of a previous universe in a repeating process. |
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| An object cosisting of a solid or gas which orbits a star. |
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| Something which moves out from a point in all direction. |
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| The opposite force to an action. |
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| A very large star, fusing helium into carbon atoms. |
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| Waves emitted by an object which are moving away have their frequencies decreased and their wavelengths increased. |
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| Suggests the universe expands but not because matter is added its appearance does not change. |
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| An enormous explosion following the end of a giant star. |
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| A device to detect and locate objects in space. |
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| A scale that describes whether something is cold or hot. |
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| Includes all the galaxies. All of space. |
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| speed in a particular direction. |
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| The absence of gravitational field strength. |
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Definition
| No longer an active star but still hot and small. |
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