What's special about each of the planets?
Billions of tons of carbon are buried underneath the Earth's surface. Studying deep life can tell us about the origins of life on our planet and perhaps even the potential for life elsewhere.
A Virgin Galactic aircraft flew high enough to breach the US Air Force-defined boundary of space before landing safely back on Earth. Company owner Richard Branson hopes to fly passengers to space by March 2019.
China is taking a small step toward its goal of becoming a space power. Its Chang'e-4 lunar rover is set to become the first manned probe to land on the rugged far side of the moon.
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