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The time interval of 365.242 days is defined as the ________.
All ________ planets have rings around their equators
The most important greenhouse effect gas in our atmosphere is ________.
The most abundant molecule in Saturn's atmosphere is ________.
Unlike our Moon and Mars, all the impact craters found on Venus are ________ in size.
The gas in an HII region is ________ hydrogen.
In addition to asteroids, ________ impacts also provided the primitive Earth with water
and organics.
Like Jupiter's, Saturn's rotation is fast and differential, with the ________ rotating
fastest.
Name each of the factors in the Drake equation.
What does it take to allow us to observe a neutron star as a pulsar?
How large are granules, and how long do they last?
What evidence is there that Earth has been struck by large meteorites?
What conditions are necessary for a total solar eclipse?
At a temperature of ________, protons and neutrons combined to form deuterium and
start cosmic nucleosynthesis.
Why could it have been possible for Jocelyn Bell to have thought the signals she found
were artificial?
At the solstice, what is the maximum angle the Sun can be above or below the equator?
Name two space probes to the jovian planets and their destinations.
How might a coronal mass ejection affect Earth?
How does human vision's peak in color sensitivity relate to the Sun?
