how big is the universe a photographic tour
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How BIG is the Universe? A Photographic Tour. Apollo 17 Lunar Rover (scale: a few metres). Space Shuttle, Columbia (scale: 100 metres). Barringer Crater, Arizona (1.2 km diam, 200 m deep - 50 m diam asteroid at 11 km/s). Earth (diam 12,756 km). Cloud covered Venus (0.95 Earth diameters).

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Presentation Transcript
slide9
The Sun(diam 1 392 000 km or 109 Earth diameters,distance 150 000 000 km or 1 astronomical unit - 1 AU)
slide10
Eclipse of the Sun by the Moon as seen from Antarctica(both subtend almost exactly the same angle of half a degree at the Earth)
slide26
Pluto and Charon - double planet(0.18 and 0.09 Earth diam1.54 Earth diam apartat 29.7 to 49.4 AU from Sun)
slide27
Comet Hale-Bopp in March 1997A comet tail can be over 1 AU long,but its nucleus measures only a few km across
slide38
Hubble Deep Field showing galaxies over 10 billion light years away (looking back in time to near the beginning of the universe)
the milky way as seen from australia notice the pink nebulae where new stars are forming
The Milky Way as seen from Australia(Notice the pink nebulae where new stars are forming)
slide42
The constellation of Orionand the Milky Way(The bright stars we see here are no more than a few hundred light years away)

Betelgeuse

Rigel

OrionNebula

slide45
New stars forming in pillars of molecular hydrogen and dust that are light years in length (in Eagle Nebula)
helix planetary nebula 1 5 light years across
Helix Planetary Nebula (1.5 light years across)

White dwarf star(remains of core of star and about size of the Earth)

Planetary nebula(remains of outer layers of star)

slide50
Cat’s Eye Planetary Nebula and white dwarf(A solar mass white dwarf would be only as big as the Earth)
crab nebula a supernova remnant remains of a star that exploded 10 light years across
Crab Nebula a supernova remnant - remains of a star that exploded10 light years across

neutron star about 10 kmacross is at centre (not visible)

slide57
A black hole a few million times the mass of the Sun lurks at the centre of our galaxy and causes nearby stars to orbit very rapidly
slide59
Gravitational lensing by a galaxy cluster 2 billion light years away bends light from a galaxy so far away that its light has been travelling for 95% of the age of the Universe
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