Sizes and scales in Astronomy. 1mm 1cm Earth: radius 6,400km equivalent to 0.5mm Jupiter 70,000km.

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Presentation transcript:

Sizes and scales in Astronomy

1mm

1cm Earth: radius 6,400km equivalent to 0.5mm Jupiter 70,000km

Sun 700,000km Earth 6,400km Jupiter 70,000km

Distance from Earth to Sun is 149,600,000km = 1AU (12m) Sun EarthJupiter 1 AU 4 AU

Heliopause – 100 AU (1.2km) Pluto’s Orbit – 40 AU

6km

100km

1500km

3000km Solar System Proxima Centauri

20,000km Stars Nearer than 5 pc: 70

Solar System 200 AU equivalent to 1mm (Earth is size of atom); 1 pc equivalent to 1m Rescale:

Stars within 5 pc

Milky way: 300,000pc across (300km)

Milky Way 30 galaxies, 10,000km across

Rescale: Milky Way 300,000pc equivalent to 10cm - Solar system smaller than size of atom - Earth 1,000 times smaller than the smallest sub-atomic particle known

Local Group Local Supercluster (Virgo, 2000 galaxies)

Observable Universe: 96,000,000,000pc across