Measuring the Hubble Constant
Measuring the Hubble Constant. The Scale of the Universe I: The Solar System. Pluto is 5.913 billion km (39.53 AU) from the Sun. The Oort cloud extends much further than this: out to around 100,000 AU or about 2 ly. The next closest star, Alpha Centauri, is 4.2ly away. 1ly=9.46 x 10 12 km.
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