Planets Riddles

I Am a Tunnel...
Riddle:
I am a tunnel, a shortcut that connects places across space and time. What am I?
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I Am Three-Quarters of the Universe
Riddle:
I am three-quarters of the universe and almost nothing is known about me. What am I?
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I Was Once a Massive Star
Riddle:
I was once a massive star and soon I will be a brightly colored gas cloud. For now, I am a massive explosion. What am I?
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You Will Find Me in Mercury, Earth, Mars, and Jupiter
Riddle:
You will find me in Mercury, Earth, Mars, and Jupiter, but not on Venus or Neptune. What am I?
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A Rock That's Bigger Than Venus
Riddle:
I am a rock that's bigger than Venus but smaller than Uranus. What am I?
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