What is the energy source for the Sun?
A) thermonuclear fusion in the core
B) radioactive decay of the nuclei of heavy elements
C) primordial heat, left behind from when the Sun first formed
D) heat released by gravitational contraction as the Sun slowly shrinks
Correct Answer:
Verified
Q194: Coronal holes are thought to be
A) conduits
Q195: The solar wind is ionized gas flowing
Q196: How much longer can the Sun continue
Q197: What is the main source of the
Q198: If a solar flare produces an X-ray
Q200: Who first postulated that the interior of
Q201: What stops the Sun from collapsing under
Q202: A positron is a
A) hydrogen nucleus.
B) theory
Q203: Which of these physical products are NOT
Q204: When two protons and two neutrons combine
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