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A
B C
D E
F G
H I
J K
L M
N O
P Q
R S
T U
V W
X Y
Z
P
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Period-Luminosity Law:
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A relationship, which describes how the
luminosity or total brightness of a Cepheid
variable star depends on the period of time
over which that intensity varies.
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Photometer:
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An instrument that measures the brightness
of light. Astronomers use photometers to gauge
the brightness of celestial objects.
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Planet:
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An object, which orbits a star. Although
lesser than stars, planets are comparatively
large and shine only by reflect light. Planets
are complete up mostly of rock or gas, with
a small, solid core.
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Pluto:
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The outmost planet in our solar system.
Pluto is, on standard, about 40 times the
Earth’s distance from the Sun. Pluto
orbit the Sun in 248 Earth years.
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Proton:
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An absolutely charged elementary particle
that resides in the nucleus of every atom.
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