Title: Copernican Redux: Dogmatic Views vs Heretical Facts in the 21st Century Solar System
1Copernican ReduxDogmatic Views vs Heretical
Facts in the 21st Century Solar System
- Frank Summers
- Space Telescope Science Institute
- April 6, 2004
2Solar System Dogma
- The solar system consists of the Sun and nine
planets
Wrong!
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4Wrong and Bad
- Memorization, not understanding
- Factoids
- Highlights differences
- Little or no relevance
- Little or no big picture
5An Improvement
- Compare and contrast
- Discuss broad ideas
- Apply to planets, moons, etc., as a group
- Highlight similarities
- Appearance
- Characteristics
- Events
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10Other Comparisons
- Craters Earth, Moon, Mercury, etc
- Volcanoes Mount St. Helens, Olympus Mons, Io,
etc - Canyons Grand Canyon, Mariner Valley
- Storms, Winds, Seasons, Weather, Ice Floes,
Magnetic Fields, Moons, Rings, etc
11Still Not Good Enough
- Messages
- What happens on Earth happens elsewhere
- Solar system is understandable
- Problems
- Need to establish facts before comparison
- Big picture still lacking
12Heresy 21st Century View
- Six is the number to memorize
- Star
- Rocky planets
- Asteroid belt
- Gas giant planets
- Kuiper belt
- Oort cloud
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16Hollywoods View of the Asteroid Belt
17Thousands of asteroids about a million miles
apart!
Scientific View of the Asteroid Belt
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20Kuiper Belt
21- Oort Cloud ?
- Billions of icy minor planets comet nuclei
- Roughly spherical out to 50,000 AU
- Predicted by Jan Oort
- Explains long-period comets
- No observations
22Families of the Solar System
- Classes of similar objects
- Size
- Composition
- Orbit size
- Orbit shape
- Orbit inclination
- Moons
- Rings
23Families of the Solar System
- Classification
- Structure of the solar system
- Similar objects lie in similar regions
- Clues to solar system formation and evolution
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25Sun Rocky Planets Asteroid Belt Gas Giant
Planets Kuiper Belt Oort Cloud
26Sun
Mercury Venus Earth Mars
Asteroid Belt
Jupiter Saturn Uranus Neptune
Kuiper Belt
Oort Cloud
27Some
May View Elaborate Mnemonics
As Boring,
Just Some Useless Nonsensical
Knowledge, But
Others Cheer
28Planet Dogma
- Pluto is the ninth planet
Wrong!
29Planet Pluto
- 1930 Tombaugh discovers Pluto
30Double Take Charon
- 1978 James Christy (USNO) observations to
refine Plutos orbit - Notices elongated images, deduces moon
- 1985 Charon occults Pluto, confirms existence
- Refined sizes and masses tiny
31First Pictures of Pluto/Charon
- 1995 Hubble Space Telescope infrared
- 1996 Hubble Space Telescope visible
32First Pictures of Pluto
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34Io
Mercury
Europa
Moon
Triton
Titan
Ganymede
Callisto
Pluto
35Heretical Facts
- Pluto is not a Rocky Planet
- Pluto is not a Gas Giant Plant
- Pluto is the oddball
- Size
- Companion
- Composition
- Orbit
- 32 resonance with Neptune
36Kuiper Belt
- History
- 1930 Leonard mentions possibility of
trans-Plutonian objects - 1943 Kenneth Edgeworth postulates objects
beyond Pluto - 1951 Gerard Kuiper predicts that a massive
Pluto would disperse small objects into a belt - 1980 Fernandez predicts belt that resembles
what was eventually found
37KBOs
- 1992 Jewitt Luu find object dubbed QB1
- Distance of 42 AU
- First (third?) object discovered in the Kuiper
Belt
38More and more KBOs
- Large searches for KBOs ensued
- Hundreds discovered within a decade
- About 700 so far (Apr 2004)
- Over 70,000 predicted with diameters gt 100 km,
orbits 30-50 AU - Plutinos Neptune resonance
- Scattered Neptune affects orbit
- Classsical Separated from Neptune
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40Defenders of the Faith
- Pluto is different from the KBOs
Wrong!
41Orbit Comparison Pluto/Charon vs 2004 DW
42Pluto/Charon orbits within Kuiper Belt
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44Size Comparison
- Pluto currently largest, but not by much
- Note plot below doesnt include Quaoar or Sedna
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46Sidebar The Sedna Heresies
- Orbit 76 840 AU
- Very red color
- Slow rotation
- Outer Kuiper Belt?
- Inner Oort Cloud?
- Planet at 70 AU?
47More Pluto Dogma
Wrong!
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49Sidebar Earth Dogma?
Earth
Moon
50Binary KBOs
- Pluto/Charon not the only binary object
- Nine discovered so far (Nov 2003)
- All types of KBOs have binaries
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52Heretical Facts Pluto
- Orbit similar to KBOs
- Size similar to KBOs
- KBO companions common
- Composition similar to KBOs
53Kuiper Belt Experts View
- So, bluntly put, one has two choices. One can
either regard Pluto as the smallest, most
peculiar planet moving on the most eccentric and
most inclined orbit of any of the planets or one
can accept that Pluto is the largest known, but
otherwise completely typical, Kuiper Belt Object.
The choice you make is up to you, but from the
point of view of trying to understand the origin
and significance of Pluto it clearly makes sense
to take the second option. - Dave Jewitt, University of Hawaii
54IAU Official Pluto Dogma
- IAU defines Pluto to be a planet
- IAU cannot define planet
- Upper limit not massive enough to produce any
form of fusion at its core - Deuterium fusion occurs for objects about 15
times Jupiters mass - No lower limit specified
- Reasonable lower limit?
- Massive enough for gravity to make it spherical
- At least 13 planets
- No reasonable definition produces 9 planets
55Dogma Flaw What is a Planet?
- Solar system alone is category of one
- What about other solar systems?
???
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58Beta Pictoris
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62We Are Not Alone
- Lots of dust disks found
- Proplyds proto-planetary disks
- Kuiper Belt sized and larger
- Some substructure seen
63Formation Dogma
- Planetary systems form in a predictable fashion
from a spinning circular disk
Wrong!
64Sun Rocky Planets Asteroid Belt Gas Giant
Planets Kuiper Belt Oort Cloud
65Planets around Other Stars
- Cannot see directly (yet)
- Detect via gravitational pull on star
- Wobble
- Periodic shift of spectral lines
- Monitor for many years (several orbits)
- Large gas giant planets detectable
66Planets around Other Stars
- Current count (Apr 2004)
- 105 planetary systems
- 120 planets
- 13 multiple planet systems
- At least 15 of sun-like stars have planets
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70Planets around Other Stars
- Jupiter mass planets in Mercury orbits
- Elliptical orbits
- Multiple Jupiter sized planets
- Saturn mass planets detected (2003)
- Planets around pulsars
71Dogma Goes Down in Flames
- Our solar system is the oddball
- Need to generalize our formation and evolution
scenarios - Implications for life in the universe
- Lots of planets
- Stability of orbits?
- New era of solar system study
72Let the Heresy Reign!
http//terpsichore.stsci.edu/summers/ - or
- Google Frank Summers
- Writings
- Not Your Parents Solar System