Which phrase accurately describes an elliptical galaxy? may be spiral-shaped has no recognizable shape has no new stars being formed has a lot of gas and dust between stars.
The Correct Answer and Explanation is :
The phrase that accurately describes an elliptical galaxy is “has no new stars being formed.”
Explanation
Elliptical galaxies are one of the primary classifications of galaxies, along with spiral and irregular galaxies. They are characterized by their smooth, featureless light distribution and are typically more three-dimensional in shape, resembling elongated spheres or ovals. Unlike spiral galaxies, which have distinct structures such as spiral arms and significant amounts of gas and dust, elliptical galaxies have a much more homogeneous appearance.
One of the defining features of elliptical galaxies is their lack of significant star formation. This is largely due to the scarcity of the cold gas and dust necessary for forming new stars. Instead, elliptical galaxies often contain older, red stars, which contribute to their overall reddish hue. This absence of new star formation implies that elliptical galaxies are often in a later stage of galactic evolution, having already used up or lost the raw materials needed to create new stars.
In contrast, spiral galaxies contain substantial amounts of gas and dust, which facilitate ongoing star formation. These galaxies are known for their beautiful spiral structures, where new stars are frequently born in regions of high density gas. The presence of these materials allows them to form blue, young stars, leading to a more vibrant appearance.
While elliptical galaxies can contain some gas, it is typically in a hot, diffuse state rather than the cold molecular clouds that are necessary for star formation. As a result, elliptical galaxies are often found in dense clusters where interactions with other galaxies can strip away their gas, further inhibiting star formation.
In summary, elliptical galaxies are primarily characterized by their older stellar populations and lack of new star formation, setting them apart from their spiral counterparts.