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How are rotation curves of spiral galaxies determined beyond radii where starlight can be detected?
Through observations of the 21cm line of atomic hydrogen
What are the types or categories for galaxies?
Spiral galaxies, barred spiral galaxies, elliptical galaxies, and irregular galaxies
Why might scientists conclude that we are living in a spiral galaxy and not in a elliptical or irregular galaxy?
Scientists conclude that we are living in a spiral galaxy, specifically the Milky Way, due to its distinct characteristics, such as the presence of prominent spiral arms, which are regions of active star formation and dust. Observations of the galaxy's structure, including its flat disk and central bulge, align with the morphology of spiral galaxies. Additionally, the rotation curves of stars and gas in the Milky Way indicate a disk-like structure typical of spiral galaxies, distinguishing it from elliptical and irregular types. These features collectively support the classification of the Milky Way as a spiral galaxy.
What are similarities between elliptical and spiral galaxies?
While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born
How many galaxies are spiral?
Approximately 60% of all galaxies are spiral
How many barred spiral galaxies there?
It's not known to any degree of accuracy, but about 66% of all spiral galaxies are barred and about 60% of galaxies in the local Universe are spiral galaxies.
How many types of spiral galaxies are there?
Yes. There are two types of spiral galaxies: "S" (normal spiral) and the less common "SB" (barred spiral, with an elongated center).
What are the 3 common galaxies?
galaxie 1, 2, 3, 4 and 5
How are galaxies classifyed?
spiral galaxies (ours), irregular galaxies, and elliptical galaxies.
Are there at least 60 billion spiral galaxies in the universe?
There at least 60 billion spiral galaxies in the universe because the spiral galaxies comprise of about 60 percent of all galaxies which are about 100 billion.
What are 5 different galaxies?
spiral, eliptical, cartwheel, barred spiral, and lenticular galaxies
The local group contains mainly spiral galaxies?
No. It has only 3 big spiral galaxies, but dozens of dwarf galaxies.
