The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it looks like. Now, new simulations may have given them a first glimpse.
Top-Level PPE Conceptual Ion Propulsion System (IPS) Block Diagram. (Credit ... The AEPS is a solar electric propulsion system that uses xenon as its propellant, much like existing ion engines.
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