SMO Overview

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A Journey Through The Universe
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Lunar Eclipse
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Eratosthenes Experiment
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Where Do I work?
UKIRT

Joint Astronomy Centre
JCMT
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United Kingdom Infrared Telescope
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James Clerk Maxwell Telescope
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Most of the Time
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And Sometimes
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Topside
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A View Towards Sagittarius PRC-98-30
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The Orion Nebula PRC-95-45a
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Inside Orion PRC-97-13
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Young Stars With Disks PRC-95-45c
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Solar System Formation
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M17 A Wider View PRC-03-13
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N44F in the LMC PRC-04-26
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NGC 604 PRC-96-27
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A Stars Life
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The Helix Nebula NGC 7293 PRC-03-11
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The Eskimo Nebula PRC-00-07
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Supernova
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Distant Supernovae PRC-98-02
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The Crab Nebula PRC-00-15c
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Getting Closer To The Crab PRC-00-15b
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LMC N49 PRC-03-20
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A Black Hole In NGC 4261 PRC-92-27
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A Jet From A Black Hole PRC-99-43e
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Black Hole In M87 PRC-94-23b
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Black Hole In M84 PRC-97-12
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Galaxy Types
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Hubbles Galaxy Tuning Fork PRC-99-34
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NGC 4622 PRC-02-03a
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NGC 3949 PRC-04-25
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NGC 1300 PRC-05-01
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Hickson Group 87 PRC-99-31
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Polar Ring Galaxy NGC 4650A PRC-99-16
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Looking For A Blank Piece Of Sky PRC-96-01h
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Hubble Deep Field North PRC-96-01
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Distant Supernova PRC-01-09
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Supernova SN2002dd In The HDF PRC-03-12
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Accelerating Universe PRC-01-09
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Probing the History of the Universe PRC2004-07
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A Slice of Time
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The Fate Of The Universe PRC-9919
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Composition Of The Universe PRC-01-09
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Stuff in the Universe
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Cosmic Tug
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Cosmic Tug PRC-06-52
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Crunch, Coast, or Rip?
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Solar System Formation
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Ancient astronomers invented geocentric models to
explain planetary motions

• Like the Sun and Moon, the planets move on the
  celestial sphere with respect to the background
  of stars
• Most of the time a planet moves eastward in
  direct motion, in the same direction as the Sun
  and the Moon, but from time to time it moves
  westward in retrograde motion

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A planet undergoes retrograde motion as seen from
Earth when the Earth and the planet pass each
other
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Johannes Kepler proposed elliptical paths for the
planets about the Sun

• Using data collected by Tycho Brahe, Kepler
  deduced three laws of planetary motion
• the orbits are ellipses
• a planets speed varies as it moves around its
  elliptical orbit
• the orbital period of a planet is related to the
  size of its orbit

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Keplers First Law
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Orbital Shapes
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Keplers Second Law
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Keplers Third Law

• P2 a3
• P planets sidereal period, in years
• a planets semimajor axis, in AU

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Planet Distances Chart
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Planet Sizes
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Solar System Sizes
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Planet Sizes Chart