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Transcript
An imaginary line around which the Earth spins (rotates.)
Rocks that orbit mostly between Mars and Jupiter.
Objects in space made of frozen gases, rock pieces, and dust. They orbit the Sun in
long, narrow orbits
CONSTELLATION A group of stars that forms a pattern
Large system of gases, dust, and many stars
GALAXY
The mutual force of attractions that exists between all objects in the universe.
GRAVITY
Process by which heat is trapped by a planet’s atmosphere.
GREENHOUSE
EFFECT
The unit of measure for distance in space equaling the distance light travels in 1 year.
LIGHT YEAR
Light travels 300,000 km(186,000 miles) per second. It takes 8 ½ minutes for light to
reach us from our Sun and 4.5 light years (4.5ly) for light to reach us from the net
closest star, Centauri Proxima.
A partial or total darkening of the moon occurring when the Earth’s shadow falls on the
LUNAR ECLIPSE
moon.
Meteoroids that burn up in the Earth’s atmosphere causing a streak of light.
METEOR
Small fragments of matter moving in space that sometimes enter Earth’s atmosphere.
METEOROIDS
When they strike the Earth, they are called
Meteorites.
A system of stars, gases and dust appearing as a bright white path across the sky. Our
MILKY WAY
solar system is in part of this galaxy.
GALAXY
The path an object follows when it revolves around another object.
ORBIT
PHOTOVOLTAIC Solar cells are made of silicon. The solar cells absorb light energy from the Sun and
release electrons, producing an electric current.
CELLS
An object in space that reflects light form a nearby star around which it revolves due to
PLANET
gravity.
An instrument that uses lenses to make distant objects appear closer. Reflecting
REFLECTING
telescopes are larger and gather more light.
TELESCOPE
An instrument that uses lenses to make distant objects appear closer. Refracting
REFRACTING
telescopes show objects more clearly than reflecting telescopes
TELESCOPE
To move around another object. The Earth revolves around the Sun.
REVOLVE
To spin-The Earth rotates on its axis.
ROTATE
An object that revolves around a larger body.
SATELLITE
A partial or total darkening of the sun occurring when the moon moves between the
SOLAR ECLIPSE
Earth and the Sun.
A system of objects in orbit around our Sun.
SOLAR SYSTEM
The time of year when the Northern Hemisphere has its longest day. June 21 or 22.
SUMMER
The North Pole of the Earth is tilted the most towards the Sun’s direct rays on this date.
SOLSTICE
All that exits, including Earth and all of space.
UNIVERSE
The time of the year when the Northern Hemisphere has its shortest day. December 21
WINTER
or 22. The North Pole of the Earth is tilted the furthest from the Sun’s direct rays.
SOLSTICE
AXIS
ASTEROIDS
COMETS
GLOSSARY
Westminster College SIM
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