'Dark nebulae' presentation slideshows

The Magnitude Scale

The Magnitude Scale. A measure of the apparent brightness Logarithmic scale Notation: 1 m .4 (smaller ? brighter) Originally six groupings 1 st magnitude the brightest 6 th magnitude is 100x dimmer So a difference of 5mag is a difference of brightness of 100

279 views • 26 slides

Finding the absolute Magnitude

Finding the absolute Magnitude. To figure out absolute magnitude, we need to know the distance to the star Then do the following Gedankenexperiment: In your mind, put the star from its actual position to a position 10 pc away

259 views • 23 slides

The Interstellar Medium

The Interstellar Medium. ISM Properties - 99% is gas, mostly H, He - about 1 atom/cm 3 - 1% is dust grains, mostly C, ices of water, ammonia, methane - 10 -6 meters in diameter - about 1 grain/100m 3. ISM Properties (continued) - Temps between 5K to 10,000K near hot stars

419 views • 14 slides

Stars in space By Ben and Iris

165 views • 6 slides