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Astronomers have evidence of a ninth planet in our solar system.
Spaceflight, crashing into Mercury, pictures of Pluto, visualizing nebulae, and X-rays from zombie stars
Space Friday has the latest on Pluto, the future of New Horizons, and an extraordinary new black hole.
On October 5, 2017, NASA's SOFIA will observe Neptune's moon Triton passing in front of a distant star.