Question

what force draws the matter in an interstellar cloud together to form a star?
a electric
b magnetism
c friction
d gravity
question: 13
most of the light emitted by the sun comes from the _.
a chromosphere
b corona
c photosphere
d prominence

Explanation:

• For the first question: Gravity is the force that causes matter in an inter - stellar cloud to come together. Electric and magnetic forces are not the dominant forces in this large - scale cosmic process. Friction is a force that acts between two surfaces in contact and is not relevant in the formation of a star from an inter - stellar cloud.
• For the second question: The photosphere is the visible surface of the Sun from which most of the light we see is emitted. The chromosphere is a layer above the photosphere but emits less light. The corona is the outermost layer of the Sun's atmosphere and is only visible during a solar eclipse (in terms of visible light, it emits mainly in the ultraviolet and X - ray regions). Prominences are large, bright features in the Sun's atmosphere but do not contribute most of the Sun's emitted light.

Answer:

1. D. gravity
2. C. photosphere