I'm a professor of astronomy who has used NASA telescopes for decades to do research in observational cosmology. I also have a keen interest in the role science plays in humanity's expansion into space. NASA's missions over the past year have been remarkably far-ranging ' from practicing how to protect the Earth to preparing for the first manned mission to Mars and learning about the earliest days in the universe. By working in the extremes, scientists are learning about and doing more in space than ever before. The Double Asteroid Redirection Test, or DART, slammed the 1,340-pound (610-kilogram) DART spacecraft into an 11 billion-pound (5 billion-kilogram) asteroid called Dimorphos. Dimorphos is the smaller of a pair of asteroids that flew past Earth last year. The impact happened 6 million miles (11.7 million kilometers) from Earth and altered the asteroid's orbit by a small but measurable amount. Dimorphos and its twin, Didymos, were never a threat to humanity, but NASA tracks...
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