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
A giant squid found at Ranheim in Trondheim 2 October 1954
The Crab Nebula, remnants of a supernova that was first observed around 1050 AD
Stars vary widely in size.
Classifying the Spectra of Stars
The Types of Stars and Their Sizes
The three-dimensional structure formed of a protein