Let's say you see a comet's nebulous (meaning `cloudy-looking') tail stretching across the sky, and it's several million kilometers long. How big is the solid object that has developed this tail, and what's it made of? a It's a giant planet like Jupiter or Saturn, made mostly of liquid hydrogen and helium. b It's a star like the Sun, just somewhat smaller than the Sun. c It's a chunk of icy material just a few kilometers across. d It's a terrestrial planetary body about the size of Earth or Venus, made mosty of rock and metal.
Let's say you see a comet's nebulous (meaning `cloudy-looking') tail stretching across the sky, and it's several million kilometers long. How big is the solid object that has developed this tail, and what's it made of? a It's a giant planet like Jupiter or Saturn, made mostly of liquid hydrogen and helium. b It's a star like the Sun, just somewhat smaller than the Sun. c It's a chunk of icy material just a few kilometers across. d It's a terrestrial planetary body about the size of Earth or Venus, made mosty of rock and metal.
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Let's say you see a comet's nebulous (meaning `cloudy-looking') tail stretching across the sky, and it's several million kilometers long. How big is the solid object that has developed this tail, and what's it made of?
a It's a giant planet like Jupiter or Saturn, made mostly of liquid hydrogen and helium.
b It's a star like the Sun, just somewhat smaller than the Sun.
c It's a chunk of icy material just a few kilometers across.
d It's a terrestrial planetary body about the size of Earth or Venus, made mosty of rock and metal.
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