Skywise Unlimited

 
ASTRO 101

Analemma
Asteroids
Aurora
Big Bang
Black Holes
Bode Titius
Brightest Stars
Comets
Constellations
Coordinates
Cosmology
Cruithne
Dark Matter
Eclipses
Galaxies
Historical
HR Diagram
Hubble's Law
Intelligent Life
Kepler's Laws
Leap Year
Light Waves
Lunar Libration
Messier Objects
Meteors
Milky Way
Moon
Moon Phases
Planets
Precession
Rainbows
Redshift
Seasons
Stellar Evolution
Stardust
Sun & Fusion
Telescopes
Tides
Time of Day
Twilight
Zodiac
 
Estimating Hubble's Constant
Hubbles Law   Hubble's Constant   Raisin Pudding   Activity Lab   Galactic Recession   Galactic Redshifts   Exam

INSTRUCTIONS

Assume all of the sample galaxies in the image below are about the same size, so that those that appear smaller are farther away - bigger is closer.

In this exercise your mouse pointer will be your redshift spectroscope.

  1. Mouseover the center of each galaxy, waiting each time for the velocity data to "pop up".
  2. Measure the width on the screen of each galaxy in centimeters,
    decimal points are ok (e.g. 1.5).
  3. Record the values (in any order) in the blanks provided below.
  4. Click on the "Tabulate Data" button. Width measurements will be converted to distances.
  5. Print the resulting page and follow the final instructions given there.
velocity = 1000 km/sec velocity = 2500 km/sec velocity = 15000 km/sec velocity = 21000 km/sec velocity = 25000 km/sec velocity = 49000 km/sec velocity = 55000 km/sec velocity = 60000 km/sec
Galaxy 1
km/sec
centimeters
Galaxy 2
km/sec
centimeters
Galaxy 3
km/sec
centimeters
Galaxy 4
km/sec
centimeters
Galaxy 5
km/sec
centimeters
Galaxy 6
km/sec
centimeters
Galaxy 7
km/sec
centimeters
Galaxy 8
km/sec
centimeters