12/28/2023 0 Comments Example of reflection nebulaEmission NebulaeĪs the name implies, emission nebulae emit emission spectra, not continuous or absorption spectra. Clouds that glow a blue color very similar to the blue of our sky.Īt this point, let's address the physical processes responsible for the appearance of these various nebulae, and give them more descriptive names.Dark clouds that appear to block all or most of the light of stars or bright clouds behind them.Clouds that glow an almost uniform, bright red.If you look at the images at the links above in some depth, you'll see some or all of the following: All of these objects are called nebulae, a word which is Latin for "cloud." Taken as a whole, the gas and dust that fills the space between stars is called the interstellar medium. In all of these images, you see different regions of space that are either filled with what appears to be glowing gas (similar to a neon light), or dark regions that are obscuring the stars behind them. APOD: The Carina Nebula Panorama from Hubble.APOD: Horsehead Nebula (note, the Horsehead is a small part of the Orion Nebula).Here are some images that show some obvious examples of regions in space that contain some material between the stars: ![]() ![]() It is true that space is so empty that it is a more perfect vacuum than we can create in the laboratory on Earth however, space is not completely empty. You have also probably been told that outer space is a “vacuum”-that is, that, other than stars and planets, it is very empty. ![]() When you observe the night sky, you see the stars as pinpoints of light against a black background. Stellar Evolution Stage 1: Giant Molecular Cloud.
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