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Q4 vocabulary
| Term | Definition |
|---|---|
| Lights years | over long period of time |
| astronomical unit | the mean distance from the center of the earth to the center of the sun. |
| Universe | the totality of known or supposed objects and phenomena throughout space; the cosmos; macrocosm. |
| Galaxy | a system of millions or billions of stars held together by gravitational attraction. |
| Celestial Object | a naturally occurring physical entity, association, or structure that exists within the observable universe. |
| Star | A large point in the night sky |
| planet | a celestial body moving in an elliptical orbit around a star. |
| Dwarf Planets | Dwarf planets like Pluto were defined as objects that orbit the Sun. |
| Moons | the natural satellite of the earth |
| Asteroids | a small rocky body orbiting the sun. |
| Comet | a celestial object consisting of a nucleus of ice and dust |
| Telescopes | An instrument designed to make distant objects appear nearer. |
| Spectra | A band of colors |
| Wavelength | the distance between successive crests of waves |
| Hertzsprung Russell Diagram | a scatter plot of stars showing the relationship between the stars' absolute magnitudes. |
| .Big Bang Theory | The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature |
| Absolute Magnitude | The magnitude of a celestial object. |
| Apparent Magnitude | the magnitude of a celestial object as it is actually measured from the earth |
| sun | The star that the earth orbits |
| Sunspot | a spot or patch appearing from time to time on the sun's surface. |
| Solar Flare | a brief eruption of intense high-energy radiation from the sun's surface. |
| Prominence | standing out from something by physically projecting or being particularly noticeable: |
| corona | the rarefied gaseous envelope of the sun and other stars |
| Photosphere | the luminous envelope of a star from which its light and heat radiate. |
| Chromosphere | a reddish gaseous layer of the sun or another star. |
| Radiative Zone | the layer of a star where energy is transported outward by radiation. |
| Convective Zone | a layer that is unstable due to convection. |
| core | the dense central region of the earth. |
| rotation | the action of rotating around an axis or center. |
| Revolution | an instance of revolving. |
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