The stars found in nebulae like the Orion Nebula probably formed
A) within the last few million years.
B) about 10 million years ago.
C) hundreds of millions of years ago.
D) billions of years ago.
E) at the beginning of the universe.
Question 2
What two energy transport mechanisms, in order from outside the core to the surface, are found in the Sun?
A) convection, conduction
B) radiative diffusion, convection
C) conduction, radiative diffusion
D) radiative diffusion, conduction
E) conduction, convection
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Astronomers identified 12-billion-year-old white dwarf stars only 100 light years away from Earth
The greatest bone mass is found around age 30 for both men and women, with the later decline being f
Hong Kong is a strange situation. A British colony since 1842, it was handed back to China in 1997 a
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