Ch 27 & 28 Astronomy

Early Models and

Astronomers

Planets May the Force be with

you

Shoot for the Moon

Objects in

Space

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Model where planets revolve around the Earth

Answer

Geocentric

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Answer

What astronomer proposed the Geocentric model?

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Aristotle

Who proposed the Heliocentric model?

Answer

Copernicus

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The law that describes the path of a planet that orbits the sun is called ________

Answer

Law of Ellipses

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What astronomer said planets moved in

epicycles, which are little circles as they went

around Earth?

Answer

Ptolemy

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What is the least dense planet that also has bands and rings made of dust and ice?

Answer

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Saturn

What is the largest planet in the solar system?

Answer

Jupiter

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Planet who’s axis is almost parallel to its

plane of orbit

Answer

Uranus

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What planet gets its color from large amounts of

methane?

Answer

Uranus

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What 2 inner planets are most alike in their size and mass?

Answer

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.

Venus and Earth

Degree of elongation of an elliptical orbit

Answer

Eccentricity

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Answer

The time required for a body to complete a single orbit

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Orbital Period

Force that PULLS on a body in space

Answer

Gravity

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When a moving body remains in a constant

motion unless acted on by an outside force

Answer

Inertia

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Pattern in which is appears as though the

planets are moving backward relative to the

stars

Answer

Retrograde Motion

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Answer

The force of gravity between Earth and moon cause _____ in bodies of

water

Tides

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Dark areas on the moons surface

Answer

Mare

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When the lighted part of the moon appears to increase, the moon

is said to be __________.

Answer

Waxing

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This occurs when the shadow of one celestial body falls on another

celestial body

Answer

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Eclipse

Answer

Name one lunar surface feature

Answers may include: Mare, rilles, ridges, craters,

regolith

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Fragments of rock that orbit the sun

Answer

Asteroid

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Small bodies of ice, rock and dust that follows highly

elliptical orbits around the sun

Answer

Comets

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Any part of a meteoroid that didn’t burn up when entering the Earth’s

atmosphere and reached Earth’s surface

Answer

Meteorite

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Region that starts beyond Neptunes orbit which

contains dwarf planets and other small bodies of ice

Answer

Kuiper Belt

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Large cloud of dust and ice believed to hold nuclei of

billions of comets and possible origin of our comets

Answer

Oort Cloud

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