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Lecture 2

Lecture 2. Updates. Human World. mm. cm. km. 100 km. 1 kton. 10 6. 10 4. 1 tonne. 10 2. Mass (kilo-gram). 1. 10 -2. 1 gm. 10 -4. 10 -6. 1 mg. 10 -4. 10 -2. 1. 10 2. 10 4. Size (meter). 0.0001. 0.01. 100. 10,000. cars. Horizon. People. breakfast cereal. dust

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Lecture 2

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  1. Lecture 2 Updates

  2. Human World mm cm km 100 km 1 kton 106 104 1 tonne 102 Mass (kilo-gram) 1 10-2 1 gm 10-4 10-6 1 mg 10-4 10-2 1 102 104 Size (meter) 0.0001 0.01 100 10,000

  3. cars Horizon People breakfast cereal dust speck sand grains Insects Human World mm cm km 100 km room of rock 1 kton 106 whale 104 1 tonne 102 Mass (kilo-gram) water density 1 10-2 1 gm 10-4 10-6 1 mg 10-4 10-2 1 102 104 Size (meter) 0.0001 0.01 100 10,000

  4. nm μm AU ly Mly 1030 1060 Visible Universe 1020 1010 1040 Stars & Planets Galaxies 1 Msun 1020 Mass (kg) Human World 1 10-20 Nuclei Atoms 10-20 10-10 1 1010 1020 1030 Size (meter)

  5. Matter in the Universe Universe voids clusters S.S. Sun ISM clouds • • • Jup. • Earth mountain • human Average cosmic density H.W. (6 H atom /m3) • cell • U atom • H atom nm μm AU ly Mly 1030 1060 1020 Neutron Star 1010 1040 galaxies • 1 Msun 1020 Mass (kg) • Nuclear density 1 Atomic density 10-20 U nuc • • H nuc 10-20 10-10 1 1010 1020 1030 Size (meter)

  6. Quasar Galaxy Star Equivalent “brightness” Light bulb Complexity in the Universe animals insects plants cells IC DNA RNA book Complexity molecules planets galaxies rock salt stars atoms 1050 10-30 10-10 1010 1030 Mass (kg)

  7. End of Lecture text

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