8th grade physical science chapter 12 flash cards about stars and galaxies
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Light-Year | the distance light travels in one year
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| Luminosity | the quantity of energy in joules a light source emits per second
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| Apparent Magnitude | the observed luminosity of a celestial body ( as a star ) as observed from Earth
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| Absolute Magnitude | the apparent magnitude a star would have if it were 32.6 light-years away from Earth
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| Spectral Line | a single wavelength of light that can be seen when the light from an excited element passes through a prism
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| Nebula | a large cloud of gas and dust in space
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| Nuclear Fusion | reaction in which two atomic nuclei combine to form a nucleus with a higher mass
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| Red Giant | a star whose radius is much larger than the Sun's and appears red because of its relatively cool surface temp.
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| White Dwarf | the small, dense, core of a giant star that remains after the star has lost its exterior matter
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| Super Nova | a super giant star that explodes before dying
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| Neutron Star | a star composed primarily of neutrons
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| Black Hole | a region of space from which no matter or radiation can escape
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| Pressure | force exerted per unit area
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| Galaxy | massive system of stars, dust, and gas, held together by gravity
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| Big Bang Theory | states that about 14 billion years ago, the universe began with a huge, fiery explosion
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| Ellipse | an oval
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| Name the 3 types of Galaxies and what Galaxy we're in | spiral, elliptical, and irregular- a spiral galaxy called "the Milky Way"
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| What is a Star? | a star is a large ball of gas that emits energy produced by nuclear reactions in the star's interior
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| What are the 5 types of stars? | Supergiant, Red Giant, Main sequence, White dwarf, and Neutron Star.
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| Spectroscopes | an instrument that can be used to study the light that comes from stars.
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| Continuous Spectra | when light from a bright lightbulb passes through a prism, it is spread out in a rainbow of colors- it is emitted by hot, dense materials, such as the filament of a lightbulb or the hot, dense gas of the Sun's photosphere
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