A View from the Back of the Envelope top

`Powers of Ten' scales
On Being Approximate
Scale of some things
Landmarks

At this site...

How Big Are Things?
Scale of some things
Scaling the universe to your desktop
Cosmic View: The Universe in 40 Jumps A copy of the 1957 classic.
Resources, including a number of related books.

Links to other sites

Quarks to Quasars, Powers of Ten
CERN's Powers of Ten (top)
rhee's Powers of Ten
Huskey's Powers of Ten
Molecular Expressions: Science, Optics and You - Powers Of 10: Interactive Java Tutorial [breaks my browser...]
Powersof10.com and Powers of Ten
Cosmic View: The Universe in 40 Jumps - by Kees Boeke

Niel Brandt's Timelines and Scales of Measurement Page
    Including Scales of Measurement, Evolutionary / Geological Timeline, Cosmological Timeline.
Universe Tree at National Solar Observatory/Sacramento Peak.
Orders of magnitude: Distance A long length scale diagram.
The Magnitudes of Physics
Data Powers of Ten [also here]
The Scale of Things A brief PoT zoom.
Exploring the Powers of Ten Rough prototype of a Java `Powers of Ten' zoomer for length.
Powers of Ten A few pictures from the movie.
Powers of Ten What are the powers of ten? Students create mathematics manipulatives to explore powers of ten.
A 26-step jaunt through space and time
A Grand Tour of the Universe, by the Powers of Ten - an NFS grant for a Museum exibit
The Powers of Ten in Time - an NSF grant
Using the Powers of Ten in Mathematics and Science Education
Scales of the Universe exibit, Rose Center, American Museum of Natural History
COCA: gallery | Powers of Ten exhibit[link broken] [discussed here]
Hidden Kingdoms - an exibit including x1000 scale objects
History of the World's HyperHistory Online
Pacing Earth's history using galactic orbits. Earth has circled the galaxy 18 times. The dinosaurs died out 2/5's of an orbit ago. Fish began almost 2 orbits ago. Multicellular life, about 4. This way of describing time is perhaps complimentary to the usual n million years ago.

A View from the Back of the Envelope
Comments encouraged. - Mitchell N Charity <mcharity@lcs.mit.edu>

Notes:
  Early ('97?) notes ripped from above...
     Either notable objects, merely ordered:
       universe, galaxy, solar system, sun, planets, mountain, you, insects,
       microbes, proteins, molecules.
     or labeling even magnitude steps (this is mass, with steps of 1010 kg):
       universe, galaxy, sun, moon, mountain, you, tiny bug, piece of cell, atom, light.
     or clumped in magnitude steps:
       universe
       moon, sun, galaxy
       knat, you, mountain
       piece of cell, atom, light
     or...
   energy density
   surface area density (sorbent)
   single massergy page?

Doables:
  Find a Geological Timescale link to replace the one which broke.
  Clean up.  Overhaul.

History:
  2003-Feb-03  Repaired links - 3 fixed, 1 left (cacr), 1 flagged, 2 added.
  2001-Aug-12  Checked links, added PoT links, slightly rearranged page.
  1998.Aug.24  And removed one which the author had not intended to make public.
  1998.Aug.21  Added a few links.
  1998.Aug.05  Added History, Doables, and links to Resources and CosmicView.
  1997.summer  Created.