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| In a galaxy, these are large collections of stars, planets, and other objects that spiral out from the core. |
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| Scientists who study outer space. |
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| The theory that all of the matter and energy in the universe was compressed into a tiny, dense ball that exploded outward, creating everything we see in the universe. |
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| A point in space with a gravitational field so intense that light can not escape. |
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| The shortening of a wavelength due to the movement of the light source towards the observer. |
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| The center of an astronomical body; it may be solid, liquid, or even orbiting black holes. |
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| Cosmic Microwave Background Radiation |
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| Leftover heat thought to be a result of the Big Bang. |
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| A change in the frequency of a wave that happens when the source and the observer are changing distance from each other. |
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| A galaxy that has the shape of a football. |
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| To estimate values or information based on known values or information. |
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| The merging together of atoms that result in a massive release of energy. |
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| A large collection of stars and planets. |
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| A sparse area that surrounds a galaxy containing older stars. |
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| A galaxy that can have any shape. |
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| Light that scatters in the atmosphere and interferes with the view of outer space. |
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| The galaxy where our solar system is located. |
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| A large mass of gas or dust, sometimes referred to as a star nursery. |
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| An ultra-dense remnant of a star. |
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| A device used to accelerate charged particles to a higher energy. |
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| A large collection of expanding gas that has a hot, blue-white star at the center. |
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| Telescopes that are able to receive radio wavelengths (the same type of wavelength that is transmitted to your radio). |
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| A very large star that is reletively cool. |
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| The lengthening of a wavelength due to the movement of the light source away from the observer. |
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| The planets or other objects that orbit a star. |
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| The speed that light is able to travel in a vacuum (about 300,000 km or 186,000 miles per second). |
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| A galaxy that has arms that form a spiral shape. |
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| The balancing act between the energy exploding out from the fusion in the core and the gravitational attraction of the star's mass. |
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| Equivalent to the mass of the sun. |
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| Light that we can see with out eyes. |
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| A very dense, old, cool star. |
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| An attractive force exerted by all matter. |
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