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
Stars and the Interstellar Medium
Plotting the Ages of Stars
Post–Main-Sequence Evolution of Low-Mass Stars
Some Shapes of Planetary Nebulae
Elements found in the element cube