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The most important greenhouse effect gas in our atmosphere i…

The most important greenhouse effect gas in our atmosphere is __________ .

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Greenhouse gases in our atmosphere trap just enough heat to…

Greenhouse gases in our atmosphere trap just enough heat to keep the earth’s oceans liquid.

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The planet which shows us the widest range of surface temper…

The planet which shows us the widest range of surface temperatures between day and night is __________ .

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While __________ gas is the main atmospheric component of bo…

While __________ gas is the main atmospheric component of both Mars and Venus, its density means it plays a far larger role in heating Venus.

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The deepest depression found on the surface of Mars is the

The deepest depression found on the surface of Mars is the

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A telescope design that uses a lens and no mirrors is a refr…

A telescope design that uses a lens and no mirrors is a refractor.

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The simplest telescope design is the prime focus reflector.

The simplest telescope design is the prime focus reflector.

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Grazing incidence optics are critical to focusing __________…

Grazing incidence optics are critical to focusing __________ .

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It is diffraction that limits the ________ of a telescope of…

It is diffraction that limits the ________ of a telescope of a given objective diameter.

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When Earth overtakes Mars, the outer planet retrogrades near…

When Earth overtakes Mars, the outer planet retrogrades near __________ .

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