Our planet is hurtling through space.
Our planet is hurtling across the universe.
Our planet is hurtling through the universe.
Do all three of these sentences convey the same meaning? Are all of them grammatically correct?
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"Across the universe" suggest "from one side to the other". And "through the universe" similarly suggests that it is travelling a large proportion of the size of the universe; at least it suggest "between galaxies". You might use these figuratively or dramatically in a science fiction (or space opera) context. But the Earth isn't going far from the sun ever.
"Through space" is probably better.