What evidence do we have that spiral arms are regions of very active star formation? Give...

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Physics

What evidence do we have that spiral arms are regions of veryactive star formation? Give an answer that includes both nebulaeand stars. What colors do we see?
In the context of galaxies and galaxy formation, whatare tidal streams, and how are they created?
By carefully measuring the velocities of stars,astronomers can graph the rotation curves of a galaxy. What doesthe rotation curve of our galaxy tell us about the mass of ourgalaxy? What mysterious substance is most of the galaxy made of,and how do we know this?

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Spiral galaxies are galaxies composed of flattened star forming dark component which have spiralbarms Spiral nebulae was the historical name of spiral arms Spirak arms are parts of spiral patterns of our gallexy Star formation occurs in spiral arms asbthe gas clouds are compressed in arms to form star There are many theories densitybwave theory states that spiral structure isba wave that moves through thebdisk causing stars and gas to clump up along the wave The See Answer

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