Interactive: How Far is Far?
More About This Resource...
Our innovative Science Bulletins are an online and exhibition program that offers the public a window into the excitement of scientific discovery. This online slide show — published in December 2005 as part of the Sloan Digital Sky Survey: Mapping the Universe Astro Feature — includes these slides:
- Expansion — how as the Universe expands, objects farther from us are receding faster;
- Motion Changes Light — how the light a space object emits changes color depending on its speed and whether it’s moving toward or away from us; and
- Color Conveys Distance — how scientists calculate a galaxy’s distance by detecting its redshift; and
- Try It! — an interactive that allows students to see firsthand how galaxy, distance, velocity, and color spectrum are related.
Less than 1 period
Supplement a study of astronomy with a classroom activity drawn from this Science Bulletin slide show.
- Ask students what they know about how scientists measure distance in space. What tools do they use? What observations do they look for?
- Working individually or in small groups, have them read the online slide show and experiment with the Try It! section.
- As a class, discuss what students learned about measuring distance in space.