Sidereal period is defined as the time interval between two successive conjunctions of a planet with
a) the Sun as observed from Earth.
b) Earth as observed from the Sun.
c) any other planet besides Earth.
d) any star other than the Sun.
d
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Protostars start off more luminous than the main sequence stars they become
Indicate whether the statement is true or false
Some light switches that glow in the dark after the lights are turned off employ
A) fluorescence. B) resonance. C) incandescence. D) all of the above E) none of the above
What was there just after the Big Bang?
A) nothing B) the primeval fireball C) a singularity D) a black hole E) everything was inside Earth
What is the Great Red Spot?
A) a long-lived, high-pressure storm on Jupiter B) a hurricane that comes and goes on Jupiter C) a place where reddish particles from Io impact Jupiter's surface D) a region on Jupiter where the temperature is so high that the gas glows with red visible light