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8th- Glencoe Ch.12

8th grade physical science chapter 12 flash cards about stars and galaxies

VocabDefinition
Light-Year the distance light travels in one year
Luminosity the quantity of energy in joules a light source emits per second
Apparent Magnitude the observed luminosity of a celestial body ( as a star ) as observed from Earth
Absolute Magnitude the apparent magnitude a star would have if it were 32.6 light-years away from Earth
Spectral Line a single wavelength of light that can be seen when the light from an excited element passes through a prism
Nebula a large cloud of gas and dust in space
Nuclear Fusion reaction in which two atomic nuclei combine to form a nucleus with a higher mass
Red Giant a star whose radius is much larger than the Sun's and appears red because of its relatively cool surface temp.
White Dwarf the small, dense, core of a giant star that remains after the star has lost its exterior matter
Super Nova a super giant star that explodes before dying
Neutron Star a star composed primarily of neutrons
Black Hole a region of space from which no matter or radiation can escape
Pressure force exerted per unit area
Galaxy massive system of stars, dust, and gas, held together by gravity
Big Bang Theory states that about 14 billion years ago, the universe began with a huge, fiery explosion
Ellipse an oval
Name the 3 types of Galaxies and what Galaxy we're in spiral, elliptical, and irregular- a spiral galaxy called "the Milky Way"
What is a Star? a star is a large ball of gas that emits energy produced by nuclear reactions in the star's interior
What are the 5 types of stars? Supergiant, Red Giant, Main sequence, White dwarf, and Neutron Star.
Spectroscopes an instrument that can be used to study the light that comes from stars.
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
Created by: heidilee16
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