Spectra

How we get spectra?

Now, what we can do with the spectra?

There's also the BSSRDFs which stands for Bidirectional Surface Scattering Reflectance

And here are the spectra of galaxies of different types.

So again, this was completely equivalent to power spectra in,

And, our spectra shown in the box to the right.

As well as the reflectance properties (the color), the... the...in a more general case it's called a bidirectional reflectance distribution function, and of course the position and distribution of the light sources.

Now spectra are hard to obtin because they require long observation times.

Now we are reviewing the spectra of about 300 stars with extrasolar planets.

They actually said that one of the stars you see in the spectra is an alien.

As we measure spectra we can tell about chemical composition of stars, not just their velocities.

That has to be compensated for, because galaxies do have different spectra, and different types will have different amount of correction.

There's, there is work from the human vision literature from Landon McCamp Who were trying to classify various edges that's belonging to either elimination changes or reflectance changes.

Thus was obtained invent something that for many it remains an impossible dream a flying saucer, gravity weapon, and a beam blanker electromagnetic spectra.

Just to run by another one this is a plan to brighten the reflectance of ocean clouds, by atomizing seawater that would brighten the albedo of the whole planet.

And then we will need another 10, 15 years with space projects to get the spectra of Earth like planets like the one I showed you.

In 1940's Carl Seyfert wrote his PhD thesis, observed bright nuclei nearby spiral galaxies and found to have these somewhat unusual spectra with very broad emission lines.

And the way we usually measure this is through Doppler broadening of their absorption lines as I'm sure you know, spectra of galaxies composed of stars, have many different absorption lines those are different elements.