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How far away can you see a cherry red roadster?

elon_musk27s_tesla_roadster_284011030419229‘Yesterday, a telescope in Chile spotted Elon Musk’s electric car 3.7 million kilometers from Earth as it was passing by star cluster NGC 5694. Using orbital elements published by NASA, amateur astronomers are setting new distance records almost every day as they track the Roadster en route to the orbit of Mars. …’

Source: SpaceWeather