Electric Engines Keep Many Satellites in Orbit

Among the challenges of deep-space travel is the amount of fuel needed for long flights. One of the solutions could be the electrical engine, powered by electricity from solar panels. Such engines already are in use aboard many satellites. Physicists consider gravity a weak force. After all, we overcome its pull each morning when we get out of bed! However, launching a satellite requires more effort: a large rocket and a lot of chemical fuel, which is quickly burned as it powers...

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