What are the major types of interstellar gas?

The interstellar gas is typically found in two forms: Cold clouds of neutral atomic or molecular hydrogen; and. Hot ionized hydrogen near hot young stars.

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What type of stars are in elliptical galaxies?

In general, the stars in elliptical galaxies are old, red stars. These galaxies look the same from all angles, too. Astronomers used the ages of the red stars in the elliptical galaxies to determine that these galaxies are pretty old. Maybe they were spirals once with gas and dust in spiral arms. How are the stars arranged in an elliptical galaxy? Elliptical galaxies are preferentially found in galaxy clusters and in compact groups of galaxies. Unlike flat spiral galaxies with organization and structure, elliptical galaxies are more three-dimensional, without much structure, and their stars are in somewhat random orbits around the center.

What are the 3 main galaxies?

Astronomers classify galaxies into three major categories: elliptical, spiral and irregular. What are the differences in galaxies? As discussed in the section on galaxy classifications, Hubble found four distinct types of galaxies: elliptical, spiral, spiral barred and irregular. Although there are different types, we also learned that each galaxy contains the same elements, but these are arranged differently for each type.

Moreover, what do the high speeds of stars in elliptical galaxies tell us quizlet?

What do the fast speeds of stars in elliptical galaxies tell us? There must be a lot of dark matter whose gravity can be felt but not seen. individual galxies are moving so fast that they could not be held together by the gravity of visible matter. 3. And another question, which best describes the motion of stars within a galaxy? Which of the following statements best describes the motions of stars in a spiral galaxy? Stars orbit the galactic center faster than the spiral arms themselves. Clouds of gas are being heated by ultraviolet light from nearby, recently formed stars.

RR Lyrae are variable, horizontal branch stars with periods ranging from a few hours to 2 days, and optical brightnesses that typically vary between 0.3 and 2 magnitudes. They lie in the instability strip of the Hertzsprung-Russell diagram and suffer instabilities that cause their size to periodically change.