Clouds that appear dark in visible light often glow when observed at long infrared wavelengths. ...

Clouds that appear dark in visible light often glow when observed at long infrared wavelengths.

Indicate whether the statement is true or false

Question 2

Compared to the distance between Earth and Mars, the distance between Jupiter and Saturn is

A) about the same.
B) much larger.
C) much smaller.
D) just slightly less.

Question 3

According to Copernicus, the retrograde motion for Mars must occur

A) at inferior conjunction, when Mars laps the Earth and passes between us and the Sun.
B) at superior conjunction, when Mars lies on the far side of the Sun.
C) at quadrature, when Mars lies exactly 90 degrees east or west of the Sun.
D) at greatest elongation, when Mars can get up to 47 degrees from the Sun.
E) at opposition, when the Earth overtakes Mars and passes between Mars and the Sun.

Question 4

The percentage (by number of atoms) of the Sun that is hydrogen is about

A) 91.
B) 71.
C) 27.
D) 9.
E) less than 1.

Question 5

The NASA mission(s) that landed on Mars in 1976 was (were) the:

A) Voyagers.
B) Magellan lander.
C) Vikings I and II.
D) Venera 14.
E) Galileo probe.

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Clouds that appear dark in visible light often glow when observed at long infrared wavelengths. ...

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