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35 Cards in this Set
- Front
- Back
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asteroids
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space rocks smaller than planets. Many are found between Mars and Jupiter.
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atmosphere
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a layer of gases surrounding a planet
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axis
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An imaginary straight line on which an object rotates.
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comets
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One of the small, icy bodies that orbit the sun that make tails of gas and dust when they get close to the sun
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Copernicus
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Proved that the sun is the center of the solar system
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density
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the amount of matter a given space
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tilt
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This causes Earth's seasons
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eclipse
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when one space object blocks the sun from reaching another.
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ellipse
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an oval shape.
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full moon
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a moon phase in which the entire face of the moon is visible
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Galileo
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first person to use a telescope scientifically
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geocentric
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a theory with Earth at the center of the universe
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gravity
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the force of attraction between masses
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heliocentric
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the theory that the Sun is at the center of the universe
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Jovian
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another name for the outer planets
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mass
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the amount of matter an object contains
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meteorite
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a meteor that hits the Earth
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meteors
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small asteroids falling through Earth's atmosphere and burning, a.k.a. shooting stars
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new moon
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a phase of the moon in which none of the moon's face is visible (when the moon is dark).
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hemisphere
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half of the Earth
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orbit
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the path of one object around another object
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phases
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monthly changes in the visible shape of the moon
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planet
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A large body in orbit around a star.
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Ptolemy
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created a theory of the universe with Earth at the center
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revolution
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The movement of a space object in an orbit around another space object
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rotation
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The spinning motion of a body about an axis.
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satellites
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Objects that orbit a planet. These can be natural, such as moons, or artificial, such as communication satellites
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shuttle
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a two-way, re-usable space vehicle
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solar system
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The sun and the planets and asteroids that revolve around it.
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space probes
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one-way space vehicles loaded with instruments to pursue science investigations in space
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star
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A ball of mostly hydrogen and helium gas that shines extremely brightly.
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terrestrial
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another name for the inner planets
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wane
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to decrease in size or intensity
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wax
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to increase in size or intensity
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weight
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gravity's pull on an object
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