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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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 1012 km
The Milky Way is full of stars, many with orbiting planets much like our solar system
the Milky Way is about 100,000 ly across
The Milky Way has two close satellite galaxies: The Large and Small Magellenic Clouds: each are about 50kpc across
1 kpc = 3261 ly
The Local Group consists of about 36 galaxies all loosely gravitationally bound together and including the Milky Way and Andromeda
The Local Group is about 3 million ly across
The Milky Way and Andromeda are the two largest (spiral galaxies) and each has several smaller 'satellite' galaxies
The Local Group is just one cluster of galaxies. There are many others 'nearby'
Clusters in today's lab which you should use:
Ursa Major I
Corona Borealis Cluster
The Local Group and several other clusters are members of the Virgo Supercluster which is about 100 million ly across
There are many Superclusters in the U.
All of our galaxies today have a redshift because they (and all galaxies in the Universe!) are moving away from us. We will use the Ca H and K lines to observe this.
receding from us by measuring
absorption line redshifts
You will have to convert km to Mpc or vice versa...