Pluto fans are attempting to reignite a contentious astronomy debate: What is a planet?
Astronomers have discovered not one, not two, but seven Earth-sized planets orbiting a star called TRAPPIST-1.
Earth will one day be eaten by our sun. These planets might avoid that.
Aerojet Rocket has been selected by NASA to develop a Solar Electric Propulsion system and the project is worth $67m. It will be used for robotic missions when travelling to an asteroid and others
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