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Science Language and Vocabulary ASTRONOMY
axis of rotation The spinning of objects around an imaginary center line
orbit The path a planet or moon takes during its revolution
phases of the moon the different shapes of the moon during a lunar cycle
reflection the process of bouncing off
revolution the circling of an object in space around another object in space
Earth’s axis of rotation imaginary poles on which the Earth spins
Earth’s tilt 23.5° angle
asteroids irregular pieces of rock that move through space
celestial objects all of the different objects in space that make up our universe
comets celestial objects made up of dust, ice, and gases that orbit the sun in a large, elliptical course
distance the measure of the amount of space between objects
gravitational pull the measurement of the pull of gravity
gravity the attraction of one mass to another
mass the amount of matter in something
meteor one of the small particles of matter in the solar system that is visible when it falls into Earth’s atmosphere
planet a celestial object, larger than asteroids or comets, that revolves around a star without giving off its own light
satellite a natural or man made object that revolves around larger objects in space
scale objects compared to a standard for accurate size perception
solar system the system made up of the eight unique planet, and many smaller objects that orbit the sun
stars celestial objects that consist of gases which generate light and heat
sun the star that is the basis of the solar system and sustains life on Earth as the source of heat and light
telescope an instrument that magnifies or makes distant objects appear larger
constellation a pattern in the stars that has been identified and named
galaxy a group of millions of stars held together by gravity
light-years the distance light can travel in one year
Milky Way Galaxy a group of about 200 billion stars formed in a disk shaped spiral that contains our solar system
speed of light 186,000 miles per second or 300,000 kilometers per second
universe the space that consists of all matter and all light and other forms of radiation and energy
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