The outer planets
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The Outer Planets PowerPoint PPT Presentation


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The Outer Planets. Uranus, Neptune and Pluto. Uranus. About 4 times diameter of Earth 3 billion km (1-3/4 billion miles) from Sun 84 Years to Circle Sun Rotates in 16 hours Five large satellites (500-1500 km), ten smaller ones Nine narrow rings. Uranus. Uranus from Voyager.

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The Outer Planets

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The outer planets

The Outer Planets

Uranus, Neptune and Pluto


Uranus

Uranus

  • About 4 times diameter of Earth

  • 3 billion km (1-3/4 billion miles) from Sun

  • 84 Years to Circle Sun

  • Rotates in 16 hours

  • Five large satellites (500-1500 km), ten smaller ones

  • Nine narrow rings


Uranus1

Uranus


Uranus from voyager

Uranus from Voyager


The rings of uranus

The Rings of Uranus


Uranus shows little detail

Uranus Shows Little Detail


Oberon

Oberon


Titania

Titania


Umbriel

Umbriel


Ariel

Ariel


Miranda

Miranda


Neptune

Neptune

  • About 4 times diameter of Earth- a bit smaller than Uranus

  • 4.5 billion km (2.8 billion miles) from Sun

  • 165 Years to Circle Sun

  • Rotates in 18 hours

  • One large satellite (2700 km), seven smaller ones

  • Four narrow rings


Neptune a twin of uranus no

Neptune: A Twin of Uranus?No!


The great dark spot

The Great Dark Spot


Neptune and triton

Neptune and Triton


Neptune s rings

Neptune’s Rings


Triton

Triton


Pluto

Pluto

  • At 2300 km, Pluto is the smallest planet

  • Has most elliptical orbit: ranges from 4.4 to 7.4 billion km from Sun (2.8-4.5 billion miles)

  • Actually crosses orbit of Neptune; closer to Sun than Neptune until 2009

  • Orbits in 248 years, 1.5 times Neptune

  • Because of orbital tilt and resonance, cannot collide with Neptune


Pluto and charon

Pluto and Charon

  • Pluto’s moon Charon is almost half as big as Pluto (1100 km)

  • Orbits only 20,000 km away

  • Pluto and Charon always keep same face to each other (rotation locked)

  • Pluto rotates, and Charon revolves, in 6.4 days


Pluto and charon1

Pluto and Charon


Pluto has three moons

Pluto Has Three Moons


Why we have to go there

Why We Have to Go There


Plutinos and the kuiper belt

Plutinos and the Kuiper Belt

  • The Kuiper Belt is an outer ice asteroid belt, probably the source of most comets

  • Hundreds are now known orbiting beyond Neptune, some beyond Pluto

  • Pluto is just the biggest of these objects and not really a planet

  • Several dozen have periods similar to Pluto’s - 250 years - and have been dubbed “plutinos.”


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