Sessions
Stars: naming conventions, magnitudes
Limiting magnitude due to light pollution
Star colors - spectra
Make and use a spectroscope to study light
This 15 minute exposure of the constellation Orion ( 'Átsé'ets'ózi, First Slim One) shows different colored "star trails". Stars are different colors because they have different temperatures; the more blue a star appears, the hotter it is, while the more red a star appears, the cooler it is. The "trails" are caused by the motion of the Earth. As the Earth rotates, the sky appears to rotate overhead; a long camera exposure records this apparent motion of the sky, so shows the stars as streaks of light rather than as points of light.
| Page Last Updated 09/23/04 | Copyright © 2004 C. Gino |