The sun is
a. a star which generates its own energy
b. 1 AU from Earth.
c. visible by its own light emission.
d. all of the above
D
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The most likely way we could terraform Mars would involve
A) adding greenhouse gases to the atmosphere B) moving the planet closer to the Sun C) restarting Martian volcanoes D) firing projectiles into the polar caps
Short-period comets, such as Halley's Comet, are believed to come from the ______________
Fill in the blank(s) with correct word
For what reason was Pluto demoted from full planetary status in 2006?
A) because of objects as large or larger than Pluto in the Kuiper belt B) because Pluto resides outside of the zone that can truly be described as the solar system C) because Pluto was discovered to be a twin planet system D) because according to the standard definition, no planet can be smaller than the Earth's moon
The specific heat capacity is highest for substances that absorb or release large quantities of heat for correspondingly
A) small temperature changes. B) large temperature changes. C) small or large changes in temperature. D) none of the above