<p>Cosmic Vertigo is back — and when they're not discussing the extremes of the Universe, Alan and Amanda are answering the big questions.Your questions.</p><p>This week, it's the little issue of water on Mars.</p>

Cosmic Vertigo is back — and when they're not discussing the extremes of the Universe, Alan and Amanda are answering the big questions.Your questions. This week, it's the little issue of water on Mars.

Cosmic Query | Red planet... Wet planet?

Do you ever feel dizzy when you think about the incomprehensible scale of space? We call that feeling Cosmic Vertigo. Welcome to a head-spinning conversation between two friends about the sparkly -- and not so sparkly -- stuff in the sky.

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Cosmic Query | Red planet... Wet planet?

Cosmic Query | Red planet... Wet planet?

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