Dear Penny,
Blue oceans, green forests, a cozy blanket of oxygen. Our planet is a super comfy home. It’s hard to imagine there was ever a time it didn’t exist.
I asked my friend Julie Ménard how Earth formed. She’s a planetary scientist at Washington State University.
She told me it started with the Big Bang. That was nearly 14 billion years ago.
“The Big Bang is not an explosion,” Ménard said. “It’s an expansion. Everything in our universe today was in a tiny spot—smaller than the eye can see. Eventually, the pressure and density got so high that it started to expand.”
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Read More ...Dear Morven, Judith, and Mara:
No matter how still we stand, or if we’re in Scotland, Malaysia, or the United States, we are always spinning. Our Earth spins at a constant, very fast speed as we make a trip around the sun.
Read More ...Dear Heidi,
It’s a big week for Pluto as NASA’s New Horizons spacecraft gets a close-up look at the distant, icy world. But first, the answer to your question: Pluto is not a planet.
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