Term
| electromagnetic radiation |
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Definition
| energy that can travel through space in the form of waves |
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| the distance between the crest of one wave and the crest of the next wave |
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| light spreading out to make a range of different colors with different wavelengths |
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| instruments that collect and focus light and other forms of electromagnetic radiation |
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Definition
| telescope that uses lenses or mirrors to collect and focus visible light |
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| uses convex lenses to gather information |
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| a piece of glass that is curved and thicker in the middle |
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| uses a curved mirror to collect and focus light |
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| a building that contains one of more telescopes |
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| detect radio waves from objects in space |
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| the apparent change in position of an object when you look at it from different places |
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| all of space and everything in it |
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| the distance light travels in one year |
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| uses powers of 10 to write very large or very small numbers |
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| a device that breaks light into colors and produces an image of the resulting spectrum |
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| a star's brightness as seen from Earth |
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| the brightness a star would have if it were a standard distance from Earth |
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Term
| Hertzsprung-Russell Diagram (HR Diagram) |
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Definition
| a graph made by two scientist that compares a star's color, mass, and temperature |
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Definition
| a diagonal area on a HR diagram where 90 percent of all stars are found |
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| a large cloud of gas and dust spread out in an immense volume |
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Definition
| a contracting cloud of gas and dust with enough mass to form a star |
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| the blue-white core of a medium mass star after the star runs out of fuel |
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| the explosion that occurs when a supergiant star runs out of fuel |
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| the remains of high mass stars |
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| an object with gravity so strong that not even light can escape |
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| star systems that have two stars |
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| a system in which one star blocks the light from another periodically |
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| Have a loose, disorganized apperance |
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| large groupings of older stars |
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| galaxies that have a bulge in the middle and arms that spiral outward |
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| galaxies that look like rounded or flattened footballs |
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| do not have a regular shape |
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| active young galaxies with huge black holes at their centers |
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| the initial explosion that resulted in the formation and expansion of the universe |
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| states that the farther away a galaxy is, the faster is it moving away from us |
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| cosmic background radiation |
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Definition
| leftover thermal energy from the big bang |
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Definition
| matter that does not give off electromagnetic radiation |
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| a new, mysterious force that is causing the expansion of the universe to accelerate |
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